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Rajakumar, S.
- Response Surface Methodology Approach for Predicting Grain Size and Tensile Strength of Friction Stir Welded AA 1100 Aluminium Alloy Joints
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Affiliations
1 Centre for Materials Joining and Research (CEMAJOR), Dept. of Manufacturing Engg., Annamalai University, Annamalai Nagar, Tamilnadu, IN
1 Centre for Materials Joining and Research (CEMAJOR), Dept. of Manufacturing Engg., Annamalai University, Annamalai Nagar, Tamilnadu, IN
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Manufacturing Technology Today, Vol 10, No 6 (2011), Pagination: 20-25Abstract
This paper reports empirical relationship to predict grain size and tensile strength of friction stir welded (FSW) AA 1100 aluminium alloy joints. Six factors, five level, central composite rotatable design matrix is used to predict the experimental conditions. The empirical relationships are developed by response surface methodology (RSM) incorporating tool and process parameters.Keywords
Welding, ANOVA, Aluminium, Microstructure.
- Effect of Bonding Temperature on Microstructure and Mechanical Properties of AISI 304 to Ti-6Al-4V Diffusion Bonded Joints
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Authors
Affiliations
1 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
1 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
Source
Manufacturing Technology Today, Vol 16, No 7 (2017), Pagination: 3-10Abstract
Solid state diffusion bonding (DB) of Ti-6Al-4V and AISI 304 were studied in the temperature range of 600-1000°C with a constant pressure of 12 MPa and holding time of 60 minutes. Micro hardness measurements and the lap shear test were carried out to determine the hardness and strength of the joints respectively. Maximum lap shear strength of 138 MPa was attained in the joint that was diffusion bonded using a temperature of 900°C, holding time of 60 min and a bonding pressure of 12 MPa. Optical microscopy and scanning electron microscopy (SEM) were used to examine the grain growth and the fine details of the interface structure.Keywords
Titanium, Diffusion Bonding, Dissimilar Joints, Micro Hardness.References
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- Balasubramanian, M; Jayabalan, V; Balasubramanian, V: Developing mathematical models to predict tensile properties of pulsed current gas tungsten arc welded Ti–6Al–4V alloy, ‘Materials & Design’, vol.29, no. 1, 2008, 92–97.
- Vigraman, T; Ravindran, D; Narayanasamy, R: Effect of phase transformation & intermetallic compounds on the microstructure and tensile strength properties of diffusion-bonded joints between Ti–6Al–4V and AISI 304, ‘Materials & Design’, vol. 36, 2012, 714–727.
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- Dheenadayalan, K; Rajakumar, S; Balasubramanian, V: Effect of Diffusion Bonding Temperature on Mechanical and Microstructure Characteristics of cp Titanium and High Strength Aluminium Dissimilar Joints, ‘Applied Mechanics and Materials’, vol.787, 2015, 495-499.
- Rajakumar, S; Balasubramanian, V: Diffusion bonding of titanium and AA 7075 aluminum alloy dissimilar joints process modeling and optimization using desirability approach, ‘Advanced Manufacturing Technology’, 2015, 1-18
- Sensitivity Analysis on Friction Stir Welding Process and Tool Parameters for Joining AA6061-T6 Aluminium Alloy Joints
Abstract Views :201 |
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Authors
Affiliations
1 Centre for Materials Joining & Research, Department of Manufacturing Engineering, Annamalai University, IN
2 Department of Manufacturing Engineering, Annamalai University, IN
1 Centre for Materials Joining & Research, Department of Manufacturing Engineering, Annamalai University, IN
2 Department of Manufacturing Engineering, Annamalai University, IN
Source
Indian Welding Journal, Vol 43, No 3 (2010), Pagination: 32-42Abstract
AA6061-T6 aluminium alloy (AlMgSi alloy) has gathered wide acceptance in the fabrication of light weight structures requiring a high strength-to weight ratio and good corrosion resistance. Compared to the fusion welding processes that are routinely used for joining structural aluminium alloys, friction stir welding (FSW) process is an emerging solid state joining process in which the material that is being welded does not melt and recast. The FSW process and tool parameters play a major role in deciding the joint strength. In this paper relationship between the FSW parameters (tool rotational speed, welding speed, axial force, shoulder diameter, pin diameter and tool hardness) and the tensile strength of the joint was established. Statistical tools such as analysis of variance (ANOVA), response surface methodology (RSM) were used to optimize the FSW parameters. A sensitivity analysis is carried out and compared the relative impact of input parameters on tensile strength in order to verify the measurement errors on the values of the uncertainty in estimated parameters.
Keywords
Friction Stir Welding, Design of Experiments, Analysis of Variance, Response Surface Methodology, Sensitivity Analysis.- Predicting the load-bearing capability of resistance spot welded advanced high strength DP-1000 steel spot joints for automotive structural and body frame applications
Abstract Views :126 |
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Authors
Affiliations
1 4Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
2 Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
3 Centre for Welding and Additive Manufacturing (C-WAM), G. S. Mandal’s Maharashtra Institute of Technology, Aurangabad, Maharashtra, India., IN
4 Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
1 4Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
2 Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
3 Centre for Welding and Additive Manufacturing (C-WAM), G. S. Mandal’s Maharashtra Institute of Technology, Aurangabad, Maharashtra, India., IN
4 Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
Source
Manufacturing Technology Today, Vol 21, No 7-8 (2022), Pagination: 13-22Abstract
Resistance spot welding (RSW) is used to overcome the issues in fusion welding of DP-1000 steel such as softening in heat affected zone (HAZ), solidification cracking, high thermal residual stresses and distortion. The main objective of this investigation is to develop the empirical relationships to predict the tensile shear fracture load bearing capability of spot joints for automotive applications. The three factor – three level box-behnken design (3X3-BBD) consisting ofless experiments was chosen for developing the experimental matrix. The lap tensile shear fracture load (LAP-TSFL) and cross tensile shear fracture load (CROSS-TSFL) tests were performed to determine the load bearing capability of spot joints. The empirical relationships of LAP-TSFL and CROSS-TSFL of spot joints were developed using polynomial regression equations incorporating the process parameters in coded form. Analysis of Variance (ANOVA) was executed to check the viability of developed empirical relationships for LAP-TSFL and CROSS-TSFL. The empirical relationship accurately predicted the LAP-TSFL and CROSS-TSFL capability of spot joints with less than 1% error at 95% confidence level.Keywords
DP-1000 Steel, Resistance Spot Welding, Optimization, Tensile Shear Fracture Load.References
- Alves, P. H. O. M., Lima, M. S. F., Raabe, D., Sandim, H. R. Z. (2018). Laser beam welding of dual-phase DP1000 steel. Journal of Materials Processing Technology, 252,498-510.
- Aydin, H. (2015). The mechanical properties of dissimilar resistance spot-welded DP600– DP1000 steel joints for automotive applications. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 229(5), 599-610.
- Chabok, A., Galinmoghaddam, E., De Hosson, J. T. M., Pei, Y. T. (2019). Micromechanical evaluation of DP1000-GI dual-phase high-strength steel resistance spot weld. Journal of materials science, 54(2), 1703-1715.
- Chabok, A., Van der Aa, E., De Hosson, J. T. M., Pei, Y. T. (2017). Mechanical behavior and failure mechanism of resistance spot welded DP1000 dual phase steel. Materials & design, 124, 171- 182.
- Khraisat, W., Abu Jadayil, W., Al-Zain, Y., Musmar, S. E. (2018). The effect of rolling direction on the weld structure and mechanical properties of DP 1000 steel. Cogent Engineering, 5(1), 1491019.
- Li, X., Wang, L., Yang, L., Wang, J., Li, K. (2014). Modeling of temperature field and pool formation during linear laser welding of DP1000 steel. Journal of Materials Processing Technology, 214(9), 1844-1851.
- Pizzorni, M., Lertora, E., Mandolfino, C., Gambaro, C. (2019). Experimental investigation of the static and fatigue behavior of hybrid ductile adhesive-RS Welded joints in a DP 1000 steel. International Journal of Adhesion and Adhesives, 95, 102400.
- Rajarajan, C., Sivaraj, P., Sonar, T., Raja, S., Mathiazhagan, N. (2022). Resistance spot welding of advanced high strength steel for fabrication of thin-walled automotive structural frames. Forces in Mechanics, 7, 100084.
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- Xue, X., Pereira, A. B., Amorim, J., Liao, J. (2017). Effects of pulsed Nd: YAG laser welding parameters on penetration and microstructure characterization of a DP1000 steel butt joint. Metals, 7(8), 292.
- Role of plasma gas flow rate on the microstructural and mechanical aspects of plasma arc welded titanium alloy joints
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Authors
Affiliations
1 Centre for Materials Joining & Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India, IN
2 Centre for Materials Joining & Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
1 Centre for Materials Joining & Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India, IN
2 Centre for Materials Joining & Research (CEMAJOR), Annamalai University, Annamalai Nagar, Tamil Nadu, India., IN
Source
Manufacturing Technology Today, Vol 21, No 5-6 (2022), Pagination: 15-22Abstract
In the present investigation, the effect and role of plasma gas flow rate on the formation of microstructure during plasma arc welding of Ti6Al4V titanium alloy were studied using microscopic observation, energy dispersive spectroscopic analysis, tensile tests and microhardness measurements. Plasma gas flow rate influences the arc pressure, arc constriction, and stability. The transformation of plasma arc from conduction mode to keyhole mode causes severe changes to the microstructural characteristics of the titanium welds. This transformation takes place with slight variations of PGFR. Weld geometries increase with an increase in the PGFR. The microstructural examination shows that there are various phases formed during the variation in PGFR. Fusion zone had acicular α and widmanstätten α. Mechanical properties (i.e) strength and hardness of the joints increase with an increase in plasma gas flow rate. In the joint welded with 1 L/min, there is the formation of α-case which is an oxygen rich brittle subsurface structure and found detrimental to the ductility of the joints.Keywords
Plasma Arc Welding, Titanium Alloy, Microstructure, Defects, Tensile, Hardness.References
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