Published Paper Details:

For the fabrication of light weight structures, aluminium alloys are most suitable. And these alloys have high strength to weight ratio and have good corrosion properties. Gas tungsten arc welding (GTA) is a one of the most economical process of joining aluminium alloys which undergo physical, chemical and metallurgical transformations as a result of fusion welding. Taguchi method of experimental design was applied here to examine the effect of input parameters on strength, hardness and corrosion resistance. Input parameters like welding current, transitional speed and voltage are used as controlling parameters to create the experimental design and each parameter is divided into three levels. Therefore, an L9 orthogonal array was used for the experimental design. Tensile, hardness and pitting corrosion tests were conducted as per the design matrix. Analysis of Variance (ANOVA) technique was used to determine the governing parameter of the process. The findings of ANOVA reveal that welding current is the most influencing parameter followed by voltage and transitional speed. Further, response surface methodology (RSM) has been used to form the mathematical model of AA2219 aluminium alloy. This mathematical model was helpful to find the predicted value of responses. The optimized parameter of AA2219 aluminium alloy was obtained by using RSM. The outcomes of RSM indicates that maximum strength, hardness and corrosion resistance is achieved when welding current, transitional speed and voltage are chosen as 150A, 70 mm/min, 31.68 kV respectively.