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Datta, G. L.
- Some Issues on Education, Training and Skilling of Welding Personnel in India
Authors
1 IIT, Kharagpur, IN
2 Kalyani Government Engineering College, Kalyani, IN
Source
Indian Welding Journal, Vol 47, No 4 (2014), Pagination: 21-21Abstract
India is a fast developing country with large population having huge potential for fast growth. Welding is extensively used in India in various industrial sectors such as railways, automotive, ship building, off-shore structures, pipes and vessels, construction, nuclear power plants, and energy. India's road network is the third largest and its rail network is the fourth largest in the world. Fabrication by welding has a major role in the infrastructure growth and the manufacturing sector including welding contributes to 15% to GDP growth in India.
Welding has been in practice in India since time immemorial. Industries, educational institutions and research organizations have been contributing to the development of welding science and technology in the country. While many industries are using state of art technologies, the breakup of the share of welding processes in fabrication and joining in India is roughly: SMAW 75%, GMAW plus GTAW 15%, SAW 3%, other fusion welding processes 3% and solid phase welding 4%. Over a million personnel are engaged in welding-related activities in India. They are engaged in development of consumables, manufacture of welding equipment and accessories, fabrication including repair and maintenance, development of welding automation and simulators, R&D in welding, and education and training in welding.
There are about 4 lakh welders working in organized and unorganized sectors in the country - majority (about 70%) of them are in the unorganized sector. Training and retraining of welders of such large number is indeed a daunting task. Vocational schools, Industrial Training Centres, Training Institutes and industrial houses provide training and certification to welders. Several educational institutions including degree and diploma colleges train welding engineers and supervisors. IIW-India also conducts AMIIW examination to certify qualified engineers and also facilitates issue of various certificates like International Welder, International Welding Engineer, etc.
The facilities available for educating, training and skilling of welding personnel in India seem to be inadequate. There seems to exist a huge gap between the projected demand and the supply. The gap can only be narrowed down if Distance Mode of Education with appropriate technologies such as Welding Training Simulators can be resorted to. The Government of India and several private organizations are taking various initiatives to rise to the occasion raising the hope of a bright future ahead.
- A Study on the Weldability of Cast Nitrogenated Stainless Steels
Authors
1 IIT, Kharagpur, IN
Source
Indian Welding Journal, Vol 27, No 3 (1994), Pagination: 61-65Abstract
The beneficial effects of nitrogen addition to wrought stainless steel have been known for some time
(1). Cast grades of nitrogenated stainless steels are comparatively of more recent origin.
- A Study on the Weldability of Cast Nitrogenated Stainless Steels
Authors
1 IIT, Kharagpur, IN
Source
Indian Welding Journal, Vol 27, No 2 (1994), Pagination: 22-24Abstract
The beneficial effects of nitrogen addition to wrought stainless steel have been known for some time
[1] Cast grades of nitrogenated stainless steels are comparatively of more recent origin.
- Higher Droplet Rate and Improved Metallurgical Properties in GMA Welding through External Magnetic Field
Authors
1 Mechanical Department, B.I.T., Khulna-9203, BD
2 Mechanical Engineering Department, I.I.T, Khargpur, IN
Source
Indian Welding Journal, Vol 25, No 1 (1992), Pagination: 33-36Abstract
Applications of external magnetic fields to welding processes are used to induce disturbances in the arc and weld pool. As a result arc deflection and changes in metal transfer characteristics are observed. Metallurgical properties of the weld metal are also affected. An investigation was undertaken to study the effect of external magnetic field on the metal transfer characteristics in CO2 welding. The metallurgical characteristics of the weld metal were also studied. It has been observed that magnetic field imposition affected the droplet transfer rates and droplet transfer times. Dendrite arm spacing of the weld metal was found to decrease with magnetic field. Magnetic field also increased the carbon diffusion rate from the high carbon base metal to the low carbon metal.Keywords
MAG Welding, External Magnetic Field, Droplet Transfer, Voltage Transients, Dendrite Arm Spacing, Carbon Diffusion.- Arc-Voltage and-Current Transients during Metal Transfer
Authors
1 Deptt. of Mechanical Engineering, Indian Institute of Technology, Kharagpur-2, West Bengal, IN
Source
Indian Welding Journal, Vol 6, No 2 (1974), Pagination: 50-54Abstract
The not-so-simple mechanisms of metal transfer constitute a major area of interest to researchers in the field of physics of arc welding. A thorough understanding of the mechanisms involving the metal transfer can help the welding engineers to a large extent in controlling the physico-metallurgical characteristics of the weldment and in designing suitable welding power sources. A great deal of research has already been conducted on the theory of metal transfer in arc welding and the available literature is quite extensive. However, the continuing research activities throughout the world is only a pointer to the very complicated nature of the problem requiring a large number of parameters to be controlled.- Metal Transfer in Metal-Arc Welding
Authors
Source
Indian Welding Journal, Vol 5, No 2 (1973), Pagination: 36-42Abstract
Cooksey and Milner (1962) examined the metal transfer characteristics of ten metals, at several currents and with diiferent polarities by high speed photography (using a Fastax WF3 camera and a xenon backing light) and compared their behaviour with the theories of metal transfer.- Metal Transfer in Metal Arc Welding
Authors
1 Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, (West Bengal), IN
Source
Indian Welding Journal, Vol 5, No 1 (1973), Pagination: 19-25Abstract
The theory of metal transfer in arc-welding has long attracted the attention of investigators since the beginning of this century. The mode of metal transfer determines, to a large extent, the techno-economical characteristics of the welding process. The metallurgical changes in the weld metal, the formation of the weld bead, the spatter losses and the positional weldability are all governed by the mode of metal transfer.- Trend in Controlling Penetration Profile in GTA Welding
Authors
1 Mechanical Engineering, I.I.T. Kharagpur-721 302, IN
Source
Indian Welding Journal, Vol 31, No 3 (1998), Pagination: 13-16Abstract
The weldpool geometry has a large bearing on the quality of the GTA welds. It is affected by the welding current, the shielding gas composition and the presence of trace elements.- Human Resource Development in Welding Technology Issues and Strategies for the Next Decade
Authors
1 Mechanical Engineering, Indian Institute of Technology, Kharagpur, IN
Source
Indian Welding Journal, Vol 32, No 2 (1999), Pagination: 25-30Abstract
It is a great honour and a privilege to be invited to deliver the Sir L. P. Misra Memorial Lecture in this international gathering of fellow welding technologists. In the past, distinguished welding experts had delivered this prestigious lecture which has been dedicated to the memory of Sir L. P. Misra, an eminent welding engineer and a visionary of our country. He was deeply interested in the development of welding technology.- Three Dimensional Finite Element Analysis of Heat Flow in Arc Welding
Authors
1 Prodn Engg and Mgt Dept, RIT Jamshedpur, 831014, IN
2 Mechanical Engineering Department, IIT Kharagpur, 721302, IN
Source
Indian Welding Journal, Vol 32, No 3 (1999), Pagination: 32-38Abstract
in the present paper a three dimensional transient finite element analysis of heat flow in arc welding has been presented. The problem was solved by considering the important factors that influence the heat transfer in arc welding, like, temperature dependent material properties, enthalpy and stirring effect in the molten pool. To reduce the computation time, finer mesh was generated where temperature gradient was too high and gradually mesh size was increased away from the heat source. Variations of temperature along the cross section at two positions of the arc were plotted and compared with the experimental and calculated values available in the literature. Temperature history curve was also plotted and compared with the published results.- 3 -d Finite Element Analysis on Heat flow In Welding Under Varying ARC Lengths
Authors
1 Prodn Engg & Mgt Dept., RIT, Jamshedpur - 831 014, IN
2 Mechanical Engineering Dept., IIT, Kharagpur - 721 302, IN
Source
Indian Welding Journal, Vol 33, No 4 (2000), Pagination: 24-29Abstract
Arc length is an important variable affecting the heat flow in welding. In the present paper, a three-dimensional transient finite element analysis on heat flow in arc welding under varying arc length conditions have been presented The problem was solved by considering the important factors that influence the heat transfer in arc welding, like temperature dependent material properties, enthalpy and stirring effect in molten pool. To reduce the computational time, the finer mesh was generated where the temperature gradient was too high and gradually mesh size was increased away from the heat source. Temperature distribution in the plate and variations of temperature along the cross-section at two positions of the arc for three arc radii were plotted for comparison.Keywords
Heat Flow, FE Analysis, Arc Welding, Arc Radius. 1.0.- Present Status of and Future Direction for Welding Technology in India
Authors
1 K L University, Guntur - 522 502, Andhra Pradesh, IN
Source
Indian Welding Journal, Vol 44, No 3 (2011), Pagination: 81-85Abstract
Introduction
Welding, as one of the most important fabrication and maintenance processes, has been playing an important role in the industrial and infrastructural development of any nation in the world since the industrial revolution that took place around 1850 when technological and economic progress gained momentum with the development of steam-powered ships, railways, and later with the internal combustion engine and electrical power generation in some Parts of the world.
- An Appraisal on Assessment of HAZ Toughness
Authors
1 National Metallurgical Laboratory, Jamshedpur 831007, IN
2 lndian Institute of Technology, Kharagpur 721302, IN