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Padmanaban, G.
- Optimizing the Pulsed Current GTAW Process Parameters to Attain Maximum Tensile Strength Using RSM
Authors
1 Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar-608002, Tamil Nadu, IN
Source
Indian Welding Journal, Vol 47, No 4 (2014), Pagination: 43-56Abstract
In this investigation, an attempt has been made to predict the tensile strength of pulsed current gas tungsten arc welded (PCGTAW) AZ31B magnesium alloy joints using RSM incorporating process parameters such as peak to base current ratio, welding speed, pulse frequency and pulse on time as variables. The experiments were conducted based on a four-factor, five-level, central composite design matrix. The developed empirical relationship can be effectively used to predict the tensile strength of PCGTAW joints of AZ31B magnesium alloy at 95% confidence level. The results indicated that welding speed and pulse frequency has the greatest influence on tensile strength, followed by current ratio, pulse on time. Response surface methodology (RSM) was used to optimize PCGTAW parameters to attain a maximum tensile strength of 214 MPa (78 % of base metal strength) in the AZ31B Magnesium alloy joints.Keywords
AZ31B Magnesium Alloy, Pulsed Current Gas Tungsten Arc Welding, Response Surface Methodology, Optimization, Tensile Strength.
- Effect of Tool Materials on Tensile Properties of Friction Stir Welded AZ31B Magnesium Alloy
Authors
1 Centre for Materials Joining & Research, Manufacturing Dept., Annamalai University, IN
Source
Indian Welding Journal, Vol 42, No 1 (2009), Pagination: 25-32Abstract
In this investigation, an attempt was made to study the effect of tool materials on tensile properties of friction stir welded AZ31B magnesium alloy. Tools made of five different materials were used to fabricate the joints. Tensile properties of the joints were evaluated and correlated with the weld zone microstructure and hardness. From this investigation, it is found that the joint fabricated using the tool made of high carbon steel exhibited superior tensile properties compared to their counterparts. The absence of defects in weld region, presence of very fine equiaxed grains in the weld region and higher hardness in the weld region are the main reasons for superior tensile properties of these joints.