Author : Ramesh Rudrapati, Nirmalendhu Chowdhury , Aasish Bandyopadhyay

Tungsten inert gas (TIG) welding is widely used technique for dissimilar welding of metals. In the present work, TIG welding operation has been studied for favorable welding condition for maximizing the ultimate load and breaking load of weld specimen. Current, gas flow rate and filler rod diameter are considered as input parameters. Experimentation has been done as erL16 orthogonal array of Taguchi method. Grey relational analysis has been utilized for converting multi-responses into single response i.e. grey relational grade. Then the analysis of signal to noise ratio has been applied to determine significance of input parameters. Optimal condition has been obtained by Taguchi method. Confirmation test have also been conducted to verify the optimum condition.

Keywords: TIG welding, Dissimilar welding, Ultimate load, Breaking load, Taguchi method, Grey relational analysis.