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- J. R. Sharma
- Abusaleh Shariff
- Tarujyoti Buragohain
- D. R. Palsaniya
- S. K. Rai
- Purusottam Sharma
- Satyapriya
- Somnath Basu
- J. S. Saini
- G. Madhusudhan Reddy
- Ashok Khanna
- L. Dorn
- D. K. Singh
- M. Breazu
- L. Issler
- P. C. Gupta
- P. G. Gupta
- T. K. Goswami
- Anup Das
- R. K. Singh
- G. I. Ramkrushna
- Jayanta Layek
- A. K. Tripathi
- S. V. Ngachan
- B. U. Choudhury
- D. P. Patel
- D. J. Rajkhowa
- Debasish Chakroborty
- B. M. Daas
- S. Ghosh
- Gurbachan Singh
- A. R. Sharma
- Y. S. Shivay
- P. K. Agarwal
- B. K. Rai
- Maqsood Ahmed
- H. M. Hussain
- K. Devakumaran
- M. Piyush
- Y. U. Pardhi
- D. Kosteas
- Ravi Ranjan Kumar
- Lutz Dorn
- K. de
- Vakumaran
- F. Hofmann
- D. K. Dwivedi
- P. S. Mishra
- Pawan Kumar Arora
- Marc Hubner
- A. K. Saxena
- M. Ravi Reddy
- Chinappa Rao
- J. Kumar
- R. K. Murali-Baskaran
- S. K. Jain
- P. N. Sivalingam
- A. Dixit
- J. Mallikarjuna
- Vinay Kumar
- K. C. Sharma
- J. Sridhar
- P. Mooventhan
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ghosh, P. K.
- Polypores that Decay Trees of Indian Botanic Garden
Abstract Views :191 |
PDF Views:115
Authors
J. R. Sharma
1,
P. K. Ghosh
1
Affiliations
1 Botanical Surety of India, Howrah, IN
1 Botanical Surety of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 31, No 1-4 (1989), Pagination: 95-102Abstract
Fifty two species of wood-rotting polyporoid hymenomycetes were found associated with decay of trees of Indian Botanic Garden. Most of them caused white rots. Oxyporus latemarginata (Dur. & Mont.) Donk, Phellinus glaucescems (Petch )Ryv. and Rigidoporus vitreus (Fr.) Donk have not been reported earlier from India. Coriolopsis luzonensis (Murr.) Sharma is a new combination proposed. Casuarina equisetifolia Forst. is the most frequent host.Full Text
- Tuberculous Pericarditis
Abstract Views :176 |
PDF Views:0
Authors
Affiliations
1 R. G. kar Medical College, Calcutta, IN
1 R. G. kar Medical College, Calcutta, IN
Source
The Indian Practitioner, Vol 8, No 7 (1955), Pagination: 637-645Abstract
No AbstractKeywords
No Keywords
- State of Life of Scheduled Castes and Scheduled Tribes in India
Abstract Views :396 |
PDF Views:1
Authors
Affiliations
1 National Council of Applied Economic Research, Human Development Programme Area, 11 I.P. Estate, New Delhi 110 002, IN
1 National Council of Applied Economic Research, Human Development Programme Area, 11 I.P. Estate, New Delhi 110 002, IN
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 43, No 1-2 (2001), Pagination: 63-83Abstract
This paper presents the levels of household income and material well-being among Scheduled Castes, Scheduled Tribe and landless wage earners in rural India. Income differentials have been estimated from the NCAER's Human Development Indicator 1994 data set, for landowners, the landless and landless wage earners among Scheduled Castes, Scheduled Tribes and other category (not including Scheduled Caste and Tribes). Among Scheduled Caste and Tribes, landholding households have a much lower level of household income than the national average. This implies that a large proportion of households among Scheduled Castes and Tribes own a very little amount of land. The household income of landless others is much higher than the household income of landless among Scheduled Castes and Tribes. However, the income differentials are least among landless wage earners irrespective of caste. Among landless others only 42 per cent are wage earners, compared to 63 per cent among Scheduled Castes and Tribes. Agricultural and allied activities contribute 56 per cent of ousehold income among Scheduled Tribes. However, the landless wage earners derive only 2.8 per cent of income from this very important source of income. Landless wage earners receive a total of 92 per cent of their income from wages out of agricultural as well as on agricultural wage work. Work participation rate (an indication of employment stress in the Indian Context) is much higher among landless wage earners or compared to that among Scheduled Caste, Scheduled Tribe, and all of rural India. It must be reiterated that land is the main asset for a decent living in rural India. But the number of landless households is increasing over time more so among Scheduled Caste. As much as 63 per cent of Scheduled Castes own land less than one hectare, compared to all-India rural average of 46 per cent and 43 per cent among Scheduled Tribes.- Natural Resource Conservation through Weather-Based Agro-Advisory
Abstract Views :214 |
PDF Views:78
Authors
Affiliations
1 Indian Grassland and Fodder Research Institute, Gwalior Road, Jhansi 284 003, IN
1 Indian Grassland and Fodder Research Institute, Gwalior Road, Jhansi 284 003, IN
Source
Current Science, Vol 111, No 2 (2016), Pagination: 256-258Abstract
Natural Resources (NR) are not only important in enhancing and sustaining economic growth, but are also key in reducing poverty through providing employment, livelihood and food security. However, these resources have been largely overexploited in an unsustainable manner for human welfare. Climate change-related events have further threatened our NR. The extreme weather events may be related to climate change and are expected to further accelerate in the coming years.Full Text
- Surface Modification of High Carbon Steel by Autogenous Pulsed Tungsten Inert Gas Arcing
Abstract Views :390 |
PDF Views:9
Authors
Affiliations
1 Uttarakhand Technical University, Dehradun, IN
2 IIT, Roorkee, IN
3 DIT University, Dehradun, IN
1 Uttarakhand Technical University, Dehradun, IN
2 IIT, Roorkee, IN
3 DIT University, Dehradun, IN
Source
Indian Welding Journal, Vol 49, No 3 (2016), Pagination: 70-80Abstract
Pulsed Tungsten Inert gas arcing (PTIGA) has been employed at various pulse parameters keeping the energy input constant for surface modification of high carbon steel (En-31) by controlled fusion. Analytical studies on thermal cycle and isotherm of fused surface have been carried out to predict microstructure of the fusion and heat affected zones. The analytical predictions have been verified by the experimental observations of modified surface characteristics. The ability of PTIGA process to control the energy input and its distribution Significantly influences the solidification behavior, nature of phase transformation and morphology of various phases in the matrix. It happens due to influence of arcing over the depth of fusion and cooling characteristics of matrix during solidification. Optimization of pulse parameters of the PTIGA process allows surface modification of En-31 steel plate with significantly improved hardness avoiding hot crackin.Keywords
Pulsed TIG Arcing, High Carbon Steel, Controlled Fusion, Thermal Characteristics, Microstructure, Hardness.- Study of Effect of Gas Tungsten Pulse Arcing on Surface Modification of Martensitic Stainless Steel
Abstract Views :413 |
PDF Views:10
Authors
Affiliations
1 Uttarakhand Technical University, Dehradun, IN
2 Department of Metallurgical and Materials Engineering, IIT Roorkee, IN
3 DIT University, Dehradun, IN
1 Uttarakhand Technical University, Dehradun, IN
2 Department of Metallurgical and Materials Engineering, IIT Roorkee, IN
3 DIT University, Dehradun, IN
Source
Indian Welding Journal, Vol 50, No 2 (2017), Pagination: 68-77Abstract
Heat energy generated from Gas Tungsten Pulse Arcing process has been used for surface modification of martensitic stainless steel. Arcing was carried out with varied pulse parameters with heat input maintained constant. Variations were observed in heating and cooling patterns of the fused zone. Their effects on fusion, solidification and consequent influence on microstructure of the fused material have been studied. The Temperature Vs. Time curve and isotherm of the fused zone have been analytically drawn. They are used to predict microstructural changes in the fused and adjacent heat affected zone of modified surface. The theoretical predictions are verified by the relevant observations on the modified surfaces. Improvement in hardness of fused zone compared to base material has been studied in conformity with the microstructural changes of the modified matrix.Keywords
Stainless Steel, Thermal Analysis, Fusion Geometry, Microstructure, Hardness.References
- (1) Groning, P, Nowak, S. and Schlapbach, L. (1991). Temp. dependent surface modifications of AISI316L and AISI440C stainless steel substrates. Appl Surf Sci, 52(4), pp.333-337.
- (2) D'Oliveira, A.S.C.M., Paredes, R.S.C. and Santos, R.L.C. (2006) Pulsed current plasma transferred arc hardfacing. J. of Mater Processing Technol, 171(2), pp.167-174.
- (3) Hashimoto, M., Miyamoto, Y., Kubo, Y., Tokumaru, S., Ono, N., Takahasi, T. and Ito, I. (1995), Surface modification of stainless steel in plasma environments, Mater Sc. & Eng, 198(1-2), pp.75-83.
- (4) Tsai, W., Shieh, C. and Lee, J. (1994) Surface modification of ferritic stainless steel by laser alloying, Thin Solid Films, 247(1), pp.79-84.
- (5) Kwok, C.T., Cheng, F.T. and Man, H.C. (2000) Laser surface modification of UNS S31603 stainless steel. Part I : microstructures & corrosion characteristics, Mater Sc.& Eng, 290(1-2), pp.55-73.
- (6) Zou, J.X., Zhang, K.M., Hao, S.Z., Dong, C. and Grosdidier, T.,(2010). Mechanism of hardening, wear and corrosion improvement of 316L Stainless steel by low energy high current pulsed electron beam surface treatment, Thin Solid Films, 519(4), pp.1405-1415.
- (7) Steyer, P., Valette, S., Forest, B., Millet, J. P., Donnet, C. and Audouard, E. (2006) Surface modification of martensitic stainless steels by laser marking and its consequences regarding corrosion resistance, Surf Eng, 3, pp.167-172.
- (8) Pan, Q.Y., Huang, W.D., Song, R.G., Zhou, Y.H. and Zhang, G.L. (1998) The improvement of localized corrosion resistance in sensitized stainless steels by laser surface remelting, Surf & Coatings Technol, 102(3), pp.245-255.
- Orlowicz, A.U. and Trytek, A. (2005), Use of the GTAW method for surface hardening of cast iron, Weld International Res Suppl,19 (5), pp.341-348.
- (10) Ghosh, P.K. and Kumar, R.(2014) Surface modification of Micro-Alloyed high-strength low-alloy steel by controlled TIG arcing process, The Minerals, Metals & Materials Society and ASM International, doi:10.1007/s11661-014-2670-x.
- (11) Goyal, V.K. (2007), Effect of thermal and solidification behavior on characteristics of pulsed current GMA weld, Ph.D thesis, IIT, Roorkee, India
- (12) Ghosh, P.K., Goyal, V.K., Dhiman, H.K. and Kumar, M. (2006), Thermal and metal transfer behavior in pulsed current gas metal arc weld deposition of Al-Mg alloy, Sci & technology of welding and joining, 11(2), pp.232-242.
- (13) Poorhaydari, K., Patchett, B.M. and Ivey, D.G. (2005). Estimation of cooling rate in the welding of plates with intermediate thickness, Weld Res, October, pp.149-s-155-s.
- (14) Nguyen, N.T., Ohta, A., Matsuoka, K., Suzuki, N. and Maeda, Y.(1999), Analytical solutions for transient temperature of semi-infinite body subjected to 3-D moving heat sources, Weld Res, Aug, pp.265-s-274-s.
- The Influence of Electrode Polarity and Welding Current on Mechanical Properties of Submerged Arc Weld (SAW) in C-Mn Steels
Abstract Views :215 |
PDF Views:4
Authors
Affiliations
1 Defence Metallugical Research Laboratory, Hydrabad 500 258, IN
2 Welding Research Laboratory, University of Roorkee, Roorkee, IN
1 Defence Metallugical Research Laboratory, Hydrabad 500 258, IN
2 Welding Research Laboratory, University of Roorkee, Roorkee, IN
Source
Indian Welding Journal, Vol 26, No 3 (1993), Pagination: 1-4Abstract
An experimental study has been carried to study the effect of electrode polarity and welding current on mechanical properties of multipass SAW welds made by using C-Mn filler wire and basic flux. Weld deposits were characterised on the basis of tensile properties, hardness and charpy impact toughness Hardness survey of the weld revealed that higher hardness occured in the coarse microstructural region than the reheat refined region. For a given polarity there was an improvement in weld impact toughness as the current decreased from 700 A to 500 A. However the trend was reverse for tensile to be better for DCEP compared to DCEN.- The Influence of Electrode Polarity and Welding Current on Mechanical Properties of Submerged Arc Weld
Abstract Views :205 |
PDF Views:4
Authors
Affiliations
1 Defence Metallurgical Research Laboratory, Hyderabad - 258, IN
2 Welding Research Laboratory, University of Roorkee, Roorkee, IN
1 Defence Metallurgical Research Laboratory, Hyderabad - 258, IN
2 Welding Research Laboratory, University of Roorkee, Roorkee, IN
Source
Indian Welding Journal, Vol 23, No 3 (1991), Pagination: 145-150Abstract
An experimental study has been made on the effect of electrode polarity on macrostruclure and mechanical properties of multipass submerged arc welds. The influence of welding current with two polarities has been studied. The welds are made by using C-Mn filler wire and basic flux. Weld deposites were characterised on the basis of tensile properties, hardness measurements and charpy impact toughness. The study of macro structure of weld deposites shows that the amount of reheat refined weldmetal increases with decreasing welding current with DCEP than that observed with DCEN. Hardness survey on the transverse section along the vertical line of the weld deposite revealed that higher hardness occured in the coarse micro structural region than the reheat refined region of the weld deposite. The charpy V-notch impact results show better toughness in the welds deposited at lower level of current with DCEP than that observed at DCEN. Yield strength and ultimate tensile strength are higher with DCEN than that observed in case of DCEP.- Flash Butt Weld Ability of Dual Phase Steel Sheet Studied by Microshear Test Method
Abstract Views :222 |
PDF Views:4
Authors
P. K. Ghosh
1,
L. Dorn
2
Affiliations
1 Welding Research Laboratory Dept. of Mechanical & Industrial Engg. University of Roorkee, Roorkee, IN
2 Institute for Machinenkonstruktion, Fugetechnik / Schweissetechnik, Technische Universitat Berlin, IN
1 Welding Research Laboratory Dept. of Mechanical & Industrial Engg. University of Roorkee, Roorkee, IN
2 Institute for Machinenkonstruktion, Fugetechnik / Schweissetechnik, Technische Universitat Berlin, IN
Source
Indian Welding Journal, Vol 25, No 1 (1992), Pagination: 24-33Abstract
Flash butt welding of dual phase steel sheet (3.7 mm) has been carried out by using different final jaw distances (FJD) of 20,30 and 40 mm and their influence on weld thermal cycle has been studied. The influence of variation in FJD on the micro-structure, microhardness and microshear strength across the weld are investigated. The mechanical properties such as ultimate tensile strength and reduction in cross sectional area of different region of heat affected zone (HAZ) are estimated by using the corresponding microshear test results. The variation in FJD has been found to affect the weld thermal cycle significantly so the microstructure and mechanical peroperties of the weldment. The region of HAZ at a.distance of about 6.0 mm from the weld centre has been found to be the weakest region of HAZ where temperature during welding rises put to about 620 ± 20°C resulting into tempering of martensite in it. The use of microshear test method has been found very much effective to study the mechanical properties of various regions of HAZ at an interval of 0.7 mm. The studies infer that the use of a comparatively higher FJD of the order of 40 mm may be beneficial for improving the post weliformability of dual phasesteel due to reduction in variation of mechanical properties observed at different regions of HAZ.- Mechanical Properties of TIG Welded Al-Zn-Mg Alloy
Abstract Views :205 |
PDF Views:4
Authors
Affiliations
1 Welding Research Laboratory, Deptt. of Mechanical & Industrial Engg., University of Roorkee, Roorkee-247 667, IN
2 Fachhochschule fur Technik Kanalstrasse 33, D-7300, Esslingen (FRG), DE
1 Welding Research Laboratory, Deptt. of Mechanical & Industrial Engg., University of Roorkee, Roorkee-247 667, IN
2 Fachhochschule fur Technik Kanalstrasse 33, D-7300, Esslingen (FRG), DE
Source
Indian Welding Journal, Vol 24, No 4 (1991), Pagination: 225-230Abstract
Welding of Al-Zn-Mg alloy has been carried out by using AG conventional continuous current and pulsed current and pulsed current Tungsten inert gas (TIG) welding processes. The influence of various welding parameters on the soundness of the weld was studied by estimation of flaws in it. The effect of flaw size present like a crack inside the weld on the tensile strength of the weld has been determined. The influence of flaw size on the fracture toughness of the weld deposit has also been studied. It has been observed that for small flaws the failure is net stress controlled, whereas for large flaws the failure has been found to be stress intensity controlled.- Welding Research Laboratory-Roorkee-An Overview
Abstract Views :262 |
PDF Views:4
Authors
P. C. Gupta
1,
P. K. Ghosh
1
Affiliations
1 Dept. of Mechanical and Industrial Engineenng, Welding Research Laboratory, University of Roorkee, Roorkee-247 667, IN
1 Dept. of Mechanical and Industrial Engineenng, Welding Research Laboratory, University of Roorkee, Roorkee-247 667, IN
Source
Indian Welding Journal, Vol 22, No 2 (1990), Pagination: 58-66Abstract
Developments of new materials, requirements of sophisticated constructions and the demand for an assurance of safety in service, calls for development of technologies which shall satisfy the service requirements and produce goods of best quality and reliability at competitive cost. Welding technology is emerging as one of the key technologies of twenty first century, the application of which can not be avoided in various works ranging from the building construction and erection of onshore and offshore structures to underwater constructions, surface transportation, aerospace vehicle manufacturing and construction of nuclear vessel.- Influence of some Upset Butt Welding Parameters on the Weld Properties of HSLA Steel
Abstract Views :224 |
PDF Views:4
Authors
Affiliations
1 Welding Research Laboratory, Deptt. of Mech. and Ind. Engg., University of Roorkee, Roorkee-247667, IN
1 Welding Research Laboratory, Deptt. of Mech. and Ind. Engg., University of Roorkee, Roorkee-247667, IN
Source
Indian Welding Journal, Vol 21, No 1 (1989), Pagination: 428-436Abstract
The effect of variation in seme upset butt welding parameters such as, current way(10-12mm) and welding way(14-20mm) on the microstructure and hardness of different region of HAZ and the toughness of the weld in high strength low alloy steel weldnu it have been studied.- An Analytical Approach for Determination of Pre-Heat Temperature
Abstract Views :202 |
PDF Views:4
Authors
Affiliations
1 Garden Reach Shipbuilders & Engineers Ltd., Calcutta, IN
1 Garden Reach Shipbuilders & Engineers Ltd., Calcutta, IN
Source
Indian Welding Journal, Vol 12, No 1 (1980), Pagination: 18-23Abstract
A plethora of base materials with widely diverse chemical and mechanical properties find application in the fabrication of equipment for the chemical and process plant industries. The range is of a variety of ferrous alloys, non-ferrous metals and alloys. Present day concepts of fabrication of such equipment depend largely on the successful application of metal joining techniques. While non-ferrous metals and alloys are joined both by fusion and non-fusion processes, ferrous alloys are in general preferred to be joined by fusion welding. Some of these ferrous alloys pose considerable difficulties for making a satisfactory joint depending on their chemistry, design and thicknesses. An unsatisfactory joint would mean a disruption in the continuity of metallic structure of the element through the joint in the form of cracks and fissures, an unacceptable deviation of metallurgical and mechanical properties of the joined metals and surroundings or other surface or sub-surface irregularities, which may contribute to fracture or premature failure in service.- Roof Water Harvesting in Hills - Innovations for Farm Diversification and Livelihood Improvement
Abstract Views :305 |
PDF Views:83
Authors
Anup Das
1,
R. K. Singh
1,
G. I. Ramkrushna
1,
Jayanta Layek
1,
A. K. Tripathi
1,
S. V. Ngachan
1,
B. U. Choudhury
1,
D. P. Patel
2,
D. J. Rajkhowa
1,
Debasish Chakroborty
1,
P. K. Ghosh
3
Affiliations
1 ICAR Research Complex for NEH Region, Umiam 793 103, IN
2 ICAR-National Institute of Abiotic Stress Management, Baramati 413 115, IN
3 ICAR-Indian Grassland and Fodder Research Institute, Jhansi 284 003, IN
1 ICAR Research Complex for NEH Region, Umiam 793 103, IN
2 ICAR-National Institute of Abiotic Stress Management, Baramati 413 115, IN
3 ICAR-Indian Grassland and Fodder Research Institute, Jhansi 284 003, IN
Source
Current Science, Vol 113, No 02 (2017), Pagination: 292-298Abstract
The north eastern region (NER) of India receives bountiful rains (>2000 mm) annually. However, there is extreme water scarcity during post- and premonsoon season (November-March). In such a situation, roof water harvesting (RWH) holds promise for multiple livelihood opportunities. RWH unit with polyfilm lined water collection tank of 37 m3 storage capacity (i.e. 5.5 x 4.5 x 1.5 m3) was demonstrated at 11 farmers fields mostly on hill tops in the Ri-Bhoi district (Meghalaya). The average demonstration area was 500 m2/farmer in the vicinity of homesteads (kitchen gardens). Volume of water harvested in a collection tank was about 53 m3 including about 16 m3 harvested during dry season due to seasonal replenishment. The cost of water harvesting was estimated at about Rs 144 and Rs 119/m3 considering lifespan of five and ten years respectively. Farmers used harvested water for diversified activities such as raising crops [maize, broccoli, French bean, laipatta (Brassica juncea), tomato, etc.] and livestock (pig or poultry) in addition to domestic use. The farmers without RWH could use land only during rainy season for crop cultivation. On an average, the net income from each RWH based model (500 m2 demonstration area) was Rs 14,910 for crop + piggery and Rs 11,410 for crop + poultry farming which was 261 and 176% higher, respectively than the normal farmers' practice. Similarly, employment and water use efficiency enhanced by 221 and 586%; and 168 and 218% under crop + piggery and crop + poultry based farming respectively.Keywords
Jalkund, Multiple Use of Water, NER Hills, Rain Water Harvesting, Silpaulin.Full Text
References
- Das, A., Mohapatra, K. P., Ngachan, S. V., Amit, D., Chowdhury, S. and Datta, D., Water resource development for multiple livelihood opportunities in Eastern Himalaya. NAIP Publication no. 6. ICAR Research Complex for NEH region, Umiam, Meghalaya, 2014, p. 36.
- Goswami, D. C., Flood forecasting in the Brahmaputra River, India: a case study. In Regional Cooperation for Flood Disaster Mitigation in the Hindkush Himalayas (eds Chalise, S. R. and Shreshtha, M.), ICIMOD.Internal Report, 2002, pp. 40–48.
- Sharma, B. R., Riaz, M. V., Pant, D., Adhikary, D. L., Bhatt, B. P. and Rahman, H., Water poverty in the north-eastern hill region (India): potential alleviation through multiple–use water systemscross learnings from Nepal Hills. New Delhi, India: International Water Management Institute (IWMI-NAIP Report 1), 2010, p. 44; doi:3910/2009.200.
- Mishra, A. K. and Satapathy, K. K., Food security vis-à-vis natural resources sustainability in northeastern region of India. ENVIS Bulletin: Himalayan Ecology, 11(1): GB Pant Institute of Himalayan Environment and Development, Kosi-Katarmal, Almora, India, 2003; http://gbpihed.nic.in/envis/HTML/vol 11_1/akmishra.htm
- Saha, R., Ghosh, P. K., Mishra, V. K. and Bujarbaruah, K. M.. Low-cost micro-rainwater harvesting technology (Jalkund) for new livelihood of rural hill farmers. Curr. Sci., 2007, 92(9), 1258–1265.
- Choudhury, B. U., Das, A., Ngachan, S. V., Bordoloi, L. J. and Chowdhury, P., Trend analysis of long term weather variables in midaltitude Meghalaya, North-East India. J. Agric. Phys., 2012, 12(1), 12–22.
- Das, A. et al., Integrated agricultural development in high altitude tribal areas - a participatory watershed programme in the East Indian Himalaya. Outlook Agric., 2013, 42(2), 141–144.
- Das, A., Saha, R., Ghosh, P. K., Munda, G. C. and Patel, D. P., Rainwater harvesting through Jalkund: a low cost dug-pit-cum polythene lined structure and its diversified use in NEH Region, abstract. Agriculture and forestry sciences. 96th Indian Science Congress, NEHU, Shillong, 3–7 January 2009, p. 75.
- Das, A. et al., Multiple use of pond water for enhancing water productivity and livelihood of small and marginal farmers. Indian J. Hill Fmg., 2013, 26 (1), 29–36.
- Patel, U. R., Patel, V. A., Balya, M. I. and Rajgor, H. M., Rooftop rainwater harvesting (RRWH) at SPSV campus, Vinegar: Gujarat – a case study. Int. J. Res. Eng. Technol., 2014, 03(04), 821–825.
- Samuel, M. P. and Satapathy K. K., Concerted rainwater harvesting technologies suitable agro-ecosystems of Northeast India. Curr. Sci., 2008, 95(9), 1130–1132.
- Composites of Graphene Oxide and Zeolite as a Potential Inhibitor for Alkaline Corrosion of Aluminium
Abstract Views :171 |
PDF Views:0
Authors
Affiliations
1 Department of Chemistry, Government Degree College, Dharmanagar – 799253, Tripura, IN
2 Integrated Science Education & Research Centre, Visva-Bharati, Santiniketan – 731235, West Bengal, IN
1 Department of Chemistry, Government Degree College, Dharmanagar – 799253, Tripura, IN
2 Integrated Science Education & Research Centre, Visva-Bharati, Santiniketan – 731235, West Bengal, IN
Source
Indian Journal of Science and Technology, Vol 10, No 25 (2017), Pagination:Abstract
Background/Objective: Metals and alloys react with corrosive media to form a stable compound, which results loss of metal and the metal surface gets corroded. Aluminium has a lot of application and so resisting aluminium corrosion is a vital step. Methodology: The inhibition ability of graphene oxide composite with ZSM-5 and MCM-41 towards aluminium corrosion in 0.01 M NaOH solution was studied using weight-loss measurement, potentiodynamic polarization curves, and SEM-EDS methods. Findings: The data from weight loss measurements, tafel plots, SEM micrographs and amperometric study in alkaline medium compared to blank solution indicated an enhancement of inhibition efficiency of graphene in the form of composite with ZSM-5 and MCM-41. SEM-EDS analyses confirmed less corrosion damage of aluminium owing to the surface adsorption of the composites. Application: This interesting study can be very vital in the field of corrosion and battery science mainly in Al-air cell.Keywords
Aluminium, Corrosion, Corrosion Inhibition, Graphene Oxide-Zeolite Composite, ZeolitesFull Text
- Agronomy for Evergreen Revolution
Abstract Views :253 |
PDF Views:70
Authors
Affiliations
1 Indian Society of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, IN
1 Indian Society of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, IN
Source
Current Science, Vol 114, No 01 (2018), Pagination: 17-19Abstract
The 4th International Agronomy Congress was inaugurated by M. S. Swaminathan (World Food Laureate). The Congress took note of the fact that today’s agriculture is challenged by climate change, land degradation, loss of biodiversity, food and energy crisis, and population explosion. To liberate the developing world, especially South Asia and Africa, from the twin scourge of hunger and poverty, we need strategies for and greater investments in natural resource management (NRM) innovation-led, accelerated and sustainable agricultural growth, with emphasis on resource-poor smallholder farmers.Full Text
- Manual Metal Arc Welding of Modified 9Cr-1Mo Steel Pipe
Abstract Views :215 |
PDF Views:4
Authors
P. K. Ghosh
1,
P. K. Agarwal
1
Affiliations
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee-247 667, IN
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee-247 667, IN
Source
Indian Welding Journal, Vol 31, No 1 (1998), Pagination: 9-18Abstract
Welding of modified 9Cr-1Mo Steel Pipe has been carried out by two filling passes using Manual Metal Arc Welding (MMAW) process at different energy inputs and post weld heat treatment at different temperatures. Microstructure-of the weld and HAZ has been studied and correlated with the post weld heat treatment and energy Input of the second pass, where the energy Input of the first pass was practically kept constant. At a given energy Input of first filling pass the influence of post weld heat treatment and energy input of the second pass on hardness of the weld and HAZ has been studied. At a given preheating the correlation among hardness (weld and HAZ). energy Input of first pass and energy Input of second pass, observed at different post weld heat treatments has been investigated. The tensile properties of weld joint, prepared at different energy Inputs of the second filling pass” and post weld heat treated at different temperatures, are also studied. It Is observed that the variation in energy input of the first and second filling passes, to control proper filling of the weld groove, affects the microstructure and hardness of the weld and HAZ. The post weld heat treatment at temperatures upto about 1123K(850"C) has been found to retain sufficient strength of the weldment. when the energy inputs of the first and second filling passes of SMAW are kept as about 2.7 and 4.1kJ/cm respectively.- Correlations of Pulse Parameters and Bead Characteristics in Pulsed Current Flux Cored Gmaw Process
Abstract Views :210 |
PDF Views:4
Authors
P. K. Ghosh
1,
B. K. Rai
1
Affiliations
1 Welding Research Laboratory, Deptt. of Mech. & Ind. Engg. University of Roorkee, Roorkee - 247 67, IN
1 Welding Research Laboratory, Deptt. of Mech. & Ind. Engg. University of Roorkee, Roorkee - 247 67, IN
Source
Indian Welding Journal, Vol 31, No 4 (1998), Pagination: 30-39Abstract
Characteristics of weld bead, deposited on steel plate by pulsed current gas metal arc welding (GMAW) process using flux cored steel wire, are studied. Variations in bead geometry and dilution are correlated to pulse parameters like mean current (Im), Pulse frequency (f) and pulse duration (tp). During pulse current welding the effect of arc voltage and welding speed on the bead geometry and dilution has also been investigated. It is observed that the change in any pulse parameter, as said above, significantly influences the peak (Ip) and base (lb) currents of the pulse and consequently affects the bead geometry and dilution. The change in arc voltage is also found to affect the Ip and lb of the pulse. A summarized influence of pulse parameters defined by a factor 0, as a function of Ip, lb, f and tb (pulse off time) has been found to be satisfactorily correlated to the bead geometry and dilution. The bead geometry and dilution observed in pulsed current GMAW process are compared to those found in continuous current GMAW process.- Characterisation of Mechanical Properties of Multipass Submerged Arc Weld by Model Analysis of Its Microstructure Facilitated by AID of Computer
Abstract Views :213 |
PDF Views:4
Authors
P. K. Ghosh
1,
Maqsood Ahmed
1
Affiliations
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee-247 667, IN
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee-247 667, IN
Source
Indian Welding Journal, Vol 32, No 4 (1999), Pagination: 32-43Abstract
An analytical model for quantitative analysis of microstructural constituents of a multipass weld produced by consumable electrode process, such as the fraction of dendritic and reheat refined zones in the matrix, has been proposed. The universality of the proposed model has been justified by Its applicability for a multipass weld deposit of any material, with due consideration of its physical properties relevant to the operation of the model expressions at appropriate steps of analysis. Empirical correlations of some mechanical properties of multipass weld of C-Mn steel with its dendrite content have been developed by preparing a data bank on the reported results. On the basis of the mathematical model expressions and the empirical relationships, a user's friendly PC based software has been developed using C language to estimate the microstructural constituents of a multipass weld prepared at given welding parameters and its mechanical properties. The database of the empirical relationship for prediction of mechanical properties of a multipass weld has been kept flexible for updating by incorporation of new data in it. The validity of estimated characteristics of a multipass submerged arc weld of C-UIn steel, such as its bead geometry, morphology, and mechanical properties, deposited at different welding parameters has been verified with a number of experimental data reported by earlier workers as well as with those produced in this work. The ready usage of the model expressions for analysis of the weld characteristics using the welding parameters reported by various workers shows the versatility of the proposed analytical model and the software.- Mechanical Properties of Pulsed Current Multipass GMA Weld of Al-Zn-Mg Alloy
Abstract Views :213 |
PDF Views:4
Authors
Affiliations
1 Welding Research Laboratory, Dept. of Mech. & Industrial Engg., University of Roorkee, Roorkee-247667, IN
2 PO. Box 61263, Hoon, LY
1 Welding Research Laboratory, Dept. of Mech. & Industrial Engg., University of Roorkee, Roorkee-247667, IN
2 PO. Box 61263, Hoon, LY
Source
Indian Welding Journal, Vol 33, No 3 (2000), Pagination: 7-18Abstract
The growing interest of using thick section of high strength aluminum alloy like Al- Zn-Mg in the fabrication of lightweight large transport container and pressure vessels necessitates the gas metal arc welding (GMAW) of this alloy. Due to its high strength, the weld joint of AI-Zn-hAg alloy is highly sensitive to fatigue failure, thus in any engineering application, an assurance about its desired tensile, fatigue and fracture toughness properties are of utmost importance. In the light of the recent observations on the superiority of using pulsed current GMAW over the conventional continuous current one to improve the mechanical properties of single pass weld of A/-Zn-Mg alloy, the present investigation has been planned to study the characteristics of multipass weld of thick section of this alloy prepared by employing pulsed current GI^AW process. The multipass welding of 25mm thick extruded section of an Al-Zn-Mg alloy has been carried out using pulsed current and continuous current gas metal arc welding (GMAW) processes. The welding has been carried out by employing 1.6mm diameter AI-!\/lg ('/41VS ASME: SFA-5.10 ER 5183) filler wire and commercial argon as shielding gas. The pulsed current welding has been performed by varying the pulse parameters such as the pulse frequency and duration and their effects on dilution, zinc pick-up, precipitation behavior, porosity content and tensile properties of the weld are studied. It is observed that the variation in pulse parameters affects the microstructure and dilution of weld deposit. The change in weld dilution has been found to control its chemistry (especially zinc level) and precipitate content dictating tensile properties of the weld. The characteristics of the pulsed current weld has been compared to those of the weld prepared by continuous current GMAW. The properties of the pulsed current weld are found superior to those of the conventional continuous current weld.Keywords
Al-Zn-Mg Alloy, Pulsed and Continuous Current GMAW, Multipass Weld, Weld Chemistry, XRD Analysis, Porosity Microstructure, Fractography Mechanical Properties.- Arc Stability of Pulse Current Gas Metal Arc Welding of Low Alloy Steel under Different Pulse Parameters and Shielding Gas Compositions
Abstract Views :250 |
PDF Views:7
Authors
Affiliations
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee -247 667, IN
2 National Institute of Technology Trichy, Trichy-620015, IN
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee -247 667, IN
2 National Institute of Technology Trichy, Trichy-620015, IN
Source
Indian Welding Journal, Vol 44, No 2 (2011), Pagination: 29-42Abstract
The arc stability and performance of pulse current gas metal arc welding (P-GMAW) process under different pulse parameters (considered as their summarized influence defined by a factor Φ and shielding gas compositions have been studied through an analysis of irregularity in pulse waveform during weld deposition of low alloy steel. The arc stability has been primarily analysed as average number of peaks (NPAJ shooting above an arbitrarily defined current (IS) at a given interval of arcing, average deviated current (IDC) defined as summation of shooting peak current (ISP) beyond the IS per peak of instability, average time interval of deviated current (TIDC) and average duration of deviated current (TDDC). The performance of the P-GMAW process has been analyzed with respect to its response to short circuiting. The effect of pulse parameters has been analyzed as a function of Φ, Im and arc voltage and the shielding gas compositions has been studied with varying content of CO2 in An It is observed that the arc stability and performance of the P-GMAW power source significantly vary with the change of pulse parameters and CO2 content of argon gas shielding. A relatively higher Φ, Im and arc voltage and low CO2 content of Ar gas shielding provides better arc stability with low short circuiting.
Keywords
P-GMAW, Arc Stability, Shielding Gas, Pulse Parameters, Low Alloy Steel.- Analysis of Fatigue Design Recommendations for Aluminum Weldments with Imperfections
Abstract Views :243 |
PDF Views:5
Authors
Affiliations
1 Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, IN
2 Inst. of Building Material and Construction, Sect. of Light Metal Structures and Fatigue, Technische Universitate Munchen, DE
1 Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, IN
2 Inst. of Building Material and Construction, Sect. of Light Metal Structures and Fatigue, Technische Universitate Munchen, DE
Source
Indian Welding Journal, Vol 42, No 3 (2009), Pagination: 31-42Abstract
The available fatigue data on weld imperfections regarding weld toe angle (WTA) and linear misalignment (LM) in the joints of Al-alloys reported by several workers has been mathematically and statistically analyzed to derive the sets of fatigue design curves for quantitative comparison with those recommended by the Eurocode. It is envisaged that as reference the newly derived design curves can assist in designing under dynamic loading with better understanding of the recommendations compared to the design curves of recommended standards. Further, for the defects like lack of penetration (LOP) and lack of fusion (LOF) the validity and shortcomings of the recommended limits of imperfection of Euronorm are evaluated with respect to the analysis put forward by the newly derived design curves. The critical analysis has proposed certain more preferable logical recommendations on economically acceptable limits of weld defects especially for the high cost intensive structures at high cycle range of 5 ×105 to 5 ×106, which should be verified further with more experimental data in this area prior to its practical implementation.
Keywords
Design Recommendations, Fusion Welded Joints, S-N Curves, Aluminum Alloys, Weld Toe Angle, Linear Misalignment, Lack of Penetration, Lack of Fusion, Imperfection Limits.- Analytical Studies on Shrinkage Stress Distribution In GMA And Pulse Current GMA Welds Of Thick Wall Stainless Steel Pipe Having Narrow And V-Groove Design
Abstract Views :281 |
PDF Views:5
Authors
Affiliations
1 Dept. of Met. & Mat. Engg., Indian Institute of Technology- Roorkee, IN
1 Dept. of Met. & Mat. Engg., Indian Institute of Technology- Roorkee, IN
Source
Indian Welding Journal, Vol 43, No 1 (2010), Pagination: 14-25Abstract
Analytical studies on mode, magnitude and distribution of shrinkage stress in eight quadrants of a thick wall stainless steel pipe weld have been carried out. The studies have been conducted on GMA and pulse current GMA welds prepared by using conventional-V and narrow weld groove designs at different welding parameters. The effects of ail such variables on the said aspects of transverse shrinkage stress have been analysed. During welding, different quadrants of pipe are found to experience shrinkage stresses of non uniform mode and magnitude and they further varies as a function of welding process, procedure and parameter. Use of P-GMAW comparatively lowers and results better uniformity in transverse shrinkage stress distribution at different quadrants of the pipe weld than that observed in case of using GMAW. Keeping higher heat input and the pulse parameter giving larger value of their summarised influence defined a well known factor 0 results higher shrinkage stress. The dimensionless factor is defined as. ϕ = [(II, / II,) f. th]. At a given heat input the narrow groove weld joint gives comparatively less transverse shrinkage stress. X-ray radiography of defect analysis reveals that the quadrants having compressive mode of stress gives rise to more lack of fusion at groove wall.
- Influence of Welding Parameters and Shielding Gas on Arc Characteristics and Behavior of Metal Transfer In GMA Welding of Mild Steel
Abstract Views :204 |
PDF Views:6
Authors
Affiliations
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, IN
2 Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623-Berlin, DE
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, IN
2 Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623-Berlin, DE
Source
Indian Welding Journal, Vol 41, No 2 (2008), Pagination: 23-33Abstract
The effects of welding parameters under Ar+18%CO2 and argon gas shielding on arc characteristics and behaviour of metal transfer in GMAW using mild steel filler wire have been studied by video-graphy of arc environment. The measured ischolar_main diameter, projected diameter, length and deflection of arc as well as the transferred droplet diameter at the time of detachment along with the estimated arc stiffness have been measured and correlated to the welding parameters under different gas shielding. It has been observed that the arc characteristics with respect to its shape, stiffness and spreading over the weld characteristics significantly vary with welding current and arc voltage giving due consideration to the shielding environment. The use of argon gas shielding appreciably reduces the arc deflection and enhances the DR, DP and L with respect to that observed under Ar+18%C02 gas shielding.
Keywords
GMAW, Arc Voltage, Welding Current, Arc Profile, Arc Pressure, Arc Deflection, Metal Transfer.- Electroless Silver Plating of Al-Mg Filler Wire used in GMAW Process
Abstract Views :245 |
PDF Views:6
Authors
Affiliations
1 Department of Mechanical and Industrial Engineering, University of Roorkee - 247667, IN
1 Department of Mechanical and Industrial Engineering, University of Roorkee - 247667, IN
Source
Indian Welding Journal, Vol 34, No 2 (2001), Pagination: 44-47Abstract
Silver plating of 1.6 mm diameter Al-Mg filler wire of MIG welding process has been carried out by electroless plating method. The plating has been performed by dipping the wire in a cyanide bath of suitable composition. The effect of plating parameters such as the bath temperature and plating time on the characteristics of Silver plating has been studied. Microstructure studies on transverse section of the plated filler has been carried out under optical microscope to study the nature of plating and its adherence with the substrate at different plating parameters. The plated silver layer has been found well adhered with the Al-Mg substrate. The optimum plating parameters giving rise to significant amount of silver plating on the filler wire has been qualitatively identified. The amount of silver plating on the 1.6mm diameter Al-Mg filler wire, obtained by this process, has been analysed to be sufficient to introduce the minimum amount of silver required in Al-Mg MIG weld deposit to improve its resistance to stress corrosion cracking (SCC) susceptibility.- Studies on Oxidation and Wear Resistance of Hard Surfacing Produced by Gas Thermal Spray of Modified Nickel Base Eutectic Alloy Powder
Abstract Views :234 |
PDF Views:6
Authors
Affiliations
1 Department of Mechanical Engineering, University of Roorkee, Roorkee, IN
2 Department of Mechanical Engineering, Regional Engineering College, Hamirpur, IN
3 Department of Materials and Metallurgical Engineering, University of Roorkee, Roorkee, IN
1 Department of Mechanical Engineering, University of Roorkee, Roorkee, IN
2 Department of Mechanical Engineering, Regional Engineering College, Hamirpur, IN
3 Department of Materials and Metallurgical Engineering, University of Roorkee, Roorkee, IN
Source
Indian Welding Journal, Vol 34, No 1 (2001), Pagination: 35-41Abstract
A commercially available Ni base eutectic alloy powder (EWACI005EC) was modified by mechanical mixing of 2wt.% Al powder with it. Hard surfacing of mild steel substrate was carried out by gas thermal spraying of both the original & modified powders. Oxidation resistance of the hard surfacing produced by using both the original & modified powders was studied under constant heating at temperatures of 800, 850 and 900°C for 8 hours and also under cyclic heating up to 15 cycles where, each cycle was designed as heating for a period of 2 hours at temperature of 800°C followed by cooling down to temperature of 300°C. The characteristics of microstructure and hardness of base metal and both the coatings of original and modified powders were studied. Wear resistance of the hard coatings of both the powders were studied at ambient temperature using “PIN on DISC” wear testing method at nominal loads of 2.5 and 3.5 kg. It was found that at all the test loads, the coating of the original powder is having comparatively better wear resistance than that of the coating of the modified powder Under the cyclic heating original powder coating was marked to be comparatively better oxidation resistant than the modified powder coating. But, at a given temperature the hard coating of the modified powder was found comparatively better oxidation resistant than the same produced by spraying the original powder.
Keywords
Thermal Spraying, Ni Base Eutectic Alloy Powder, Modification of Alloy Powder, Hard Surfacing, Micro Structure, Hardness, Wear, Oxidation Resistance.- Control of Residual Stresses Using Narrow Gap Technique in SMA Welding of Structural Steel
Abstract Views :255 |
PDF Views:6
Authors
Affiliations
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, IN
2 Department of Mechanical Engineering, Dehradun Institute of Technology, Dehradun, IN
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, IN
2 Department of Mechanical Engineering, Dehradun Institute of Technology, Dehradun, IN
Source
Indian Welding Journal, Vol 36, No 1 (2003), Pagination: 9-15Abstract
Welding of structural steel plate having conventional V-Groove and narrow grooves of different designs has been carried out by GTAW ischolar_main pass followed by SMAW filler passes. The residual stresses of the weld and HAZ have been measured by centre drill hole technique using three-element strain gauge rosette. Effect of narrow gap welding of different groove design on residual stresses of weld joint has been studied. The effect of variation in heat input per pass in the SMAW filler passes of the narrow gap welds on residual stresses of the weld joint also has been studied. The residual stresses along with the microstructure and hardness of the conventional and narrow gap weld joints have been compared. It has been observed that the use of narrow gap welding with comparatively low heat input reduces the residual stresses of weld joint significantly compared to that observed in conventional V-Groove weld. This is primarily attributed to reduction in amount of weld deposit lowering the contraction stresses in narrow gap weld.- Computer Aided Pulsed Current GMA Welding of Aluminium Alloys
Abstract Views :187 |
PDF Views:8
Authors
Affiliations
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, IN
2 Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623 Berlin, DE
1 Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, IN
2 Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623 Berlin, DE
Source
Indian Welding Journal, Vol 37, No 3&4 (2004), Pagination: 31-38Abstract
A user friendly software has been developed to select the pulse parameters for a given weld quality on the basis of empirical correlations amongst the pulse parameters and algorithms in reference to a summarised influence of pulse parameters defined by a dimensionless factor. The software enable to understand the controll of pulse parameters to maintain a stable arc for a desired weld quality of Al-Mg alloy deposit, currently considered as porosity content of it. The software has been sucessfully tried to operate a modern pulsed current GMAW power source in producing weld within a desired level of porosity content. The understanding over the characteristics of the variation in pulse parameters and their control with the help of software has been discussed to provide confidence in more wide use of pulsed current GMAW to produce weld of desired quality.- Weldability of Controlled Rolled Micro Alloyed Thick HSLA Steel Plates for Fabrication of Penstock Liners
Abstract Views :211 |
PDF Views:5
Authors
Affiliations
1 Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee - 247667, IN
2 Department o f Metallurgical and Materials Engineering Indian Institute o f Technology Roorkee - 247667, IN
1 Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee - 247667, IN
2 Department o f Metallurgical and Materials Engineering Indian Institute o f Technology Roorkee - 247667, IN
Source
Indian Welding Journal, Vol 38, No 1 (2005), Pagination: 56-65Abstract
Weldability of a controlled rolled HSLA steel plates having thickness of 18, 25 and 34 mm has been studied by multipass SAW process with SMAW ischolar_main pass. The mechanical and metallurgical properties of the all weld deposit and axial weld joint have been studied. In 34 mm thick plate the weld metal microstructure has been found comparatively finer with more reheat refinement than 18 mm and 25mm thick plates, with improved properties. The weld joints are generally found to fracture from the region away from fusion line showing the strength of the weld higher than the base material. However, the presence of certain amount of inclusions may have lowered the mechanical properties of weld deposits up to certain extent. Reheat refining has been found to improve the toughness of weld metal. The toughness of HAZ mostly found comparable to that of the base metal as such the weldability of controlled rolled HSLA steel has been qualified for welding fabrication of penstock liner.- Distortion and Transverse Shrinkage Stress in Butt Welds of Steel Plates Under Different Welding Procedure and Parameters of GMAW and SMAW Processes
Abstract Views :233 |
PDF Views:7
Authors
Affiliations
1 Dept. of Met. & Mat. Engg., Indian Institute of Technology - Roorkee, IN
1 Dept. of Met. & Mat. Engg., Indian Institute of Technology - Roorkee, IN
Source
Indian Welding Journal, Vol 39, No 1 (2006), Pagination: 15-23Abstract
The transverse shrinkage stress generated in welding of 10, 12 and 25 mm thick steel plates using different welding processes and procedures has been estimated and its varying effect has been verified with the help of experimental measurement of distortion produced during welding. The weld joints of 10 and, 12 mm thick plates have been prepared by using the GMAW and pulsed current GMAW (P-GMAW) processes with standard V-groove design whereas the 25 mm thick plate was welded by SMAW process employing V- groove and narrow groove design. At a given heat input and weld groove size the effect of welding processes and procedures on variation of shrinkage stresses in weld deposit causing distortion of weld joint has been substantiated by estimation of bending stress developed in the weld joint through measurement of bending of the plate. It is observed that the use of PGMAW is advantageous over the GMAW with respect to reduction in stress development in weld joint. The use of narrow groove design has also been found beneficial for reduction of stresses generated in the weld joint in comparison to those observed in case of using V-groove design.- Use of Pulse Current MIG Welding Improves the Weld Characteristics of Al-Zn-Mg Alloy
Abstract Views :209 |
PDF Views:5
Authors
P. K. Ghosh
1,
P. C. Gupta
1
Affiliations
1 Welding Research Laboratory. Deptt. of Mech. and Ind. University of Roorkee. Roorkee 247 667, IN
1 Welding Research Laboratory. Deptt. of Mech. and Ind. University of Roorkee. Roorkee 247 667, IN
Source
Indian Welding Journal, Vol 29, No 2 (1996), Pagination: 24-32Abstract
Extruded sections of commercial Al-Zn-Mg alloy have been welded by continuous and pulsed current MIG welding processes, using 1.6mm diameter Al-Mg filler wire. During welding the current and other pulse parameters such as its frequency and duration are varied and their influence on the weld bead geometry, chemical composition, hardness and porosity content are studied. The influence of various parameters on the recrystallization at HAZ adjacent to the fusion line has been examined. Finally the performance of the weldments under static and dynamic tensile loading are also investigated. The properties of the weldments prepared under pulsed MIG process are correlated to those of the weldments prepared by the conventional continuous current welding. It has been observed that a critical and selective use of pulse parameters improve the weldment properties as compared with those of the conventional weldments.- Weldbonding of Mild Steel
Abstract Views :194 |
PDF Views:5
Authors
P. K. Ghosh
1,
Chinappa Rao
1
Affiliations
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee - 247 667, IN
1 Welding Research Laboratory, Department of Mechanical & Industrial Engineering, University of Roorkee, Roorkee - 247 667, IN
Source
Indian Welding Journal, Vol 30, No 3 (1997), Pagination: 35-47Abstract
Weldbonding of mild steel sheets was earned out by adhesive joining followed by resistance spot welding of two pieces. Finally the joint was cured at different temperatures and times. The spot welding was earned out at different welding currents and weid times. Conventional resistance spot weld ana normal adhesive joints of the mild steel were also prepared. The normal adhesive joints were used to optimise the curing schedule. The microstructure, hardness, ultimate shear tensile load carrying capacity and fatigue life of the weldbond and resistance spot weld were studied and compared. The weldbonding was found to improve the strength and fatigue life of the joint considerably in comparison to those obsen/ed in the case of conventional resistance spot weld.- Biotic Stresses Of Agricultural Crops in India: Re-Visiting National Status And Mitigation Strategies
Abstract Views :281 |
PDF Views:80
Authors
J. Kumar
1,
R. K. Murali-Baskaran
1,
S. K. Jain
1,
P. N. Sivalingam
1,
A. Dixit
1,
J. Mallikarjuna
1,
P. K. Ghosh
1
Affiliations
1 ICAR-National Institute of Biotic Stress Management, Raipur 493 225, IN
1 ICAR-National Institute of Biotic Stress Management, Raipur 493 225, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 264-265Abstract
Food crops in India suffer from many newly emerging and invading biotic stresses, i.e. insect pests/ diseases/weeds. For sustainable food production, it will be worthwhile to switch into novel mitigation measures rather than protecting the crops by traditional methods of pest management which are now outdated and incompetent. Emphasis must be laid on the identification of novel mitigation measures based upon molecular markers, transgenes, gene-editing technologies, nanotechnology, etc.Full Text
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- Emerging and Re-emerging Biotic Stresses of Agricultural Crops in India and Novel Tools for their Better Management
Abstract Views :327 |
PDF Views:79
Authors
J. Kumar
1,
R. K. Murali-Baskaran
1,
S. K. Jain
1,
P. N. Sivalingam
1,
J. Mallikarjuna
1,
Vinay Kumar
1,
K. C. Sharma
1,
J. Sridhar
1,
P. Mooventhan
1,
A. Dixit
1,
P. K. Ghosh
1
Affiliations
1 ICAR-National Institute of Biotic Stress Management, Raipur 493 225, IN
1 ICAR-National Institute of Biotic Stress Management, Raipur 493 225, IN
Source
Current Science, Vol 121, No 1 (2021), Pagination: 26-36Abstract
Food security of our country is at risk due to heavy yield losses of agricultural crops caused by pests and diseases known together as biotic stresses. Conventional management practices in vogue are not competent under the current situations obscured by the incitants of biotic stresses which have either enhanced their offensive capabilities due to adaptive mutations or regained their pathogenic/ herbivory potential owing to climate change. Numerous causal agents of biotic stresses are also introduced in the country or new regions of the country either through natural dispersal as invasive species, or on account of quarantine irregularities at national or international levels. Therefore, it is of utmost importance to appraise the impact of these new biotic stresses burgeoned in the recent past and to develop novel technologies for their management. To devise an effective preventive and eradicative strategy for containing these biotic stresses, new research innovations need to be practiced such as deciphering basic/molecular mechanism of host-pathogen/insect interactions; endophytic mechanisms of plant protection; nanotechnology in pest management; host resistance strengthening by gene cloning, recombinant DNA technologies, RNA biology, utilizing gene editing technologies such as CRISPR/Cas9, etc. This article presents a comprehensive account of new biotic stresses of agricultural crops built up in the country and also reviews the novel scientific inventions made worldwide which can be further employed to devise more efficient methods for alleviating impact of these biotic stresses of food crops in the country.Keywords
Agriculture, Biotic Stress, Crops, Food Security, Management.Full Text
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