TIG Welding Process Parameter Optimization for Aluminium Alloy 6061 Using Grey Relational Analysis and Regression Equations

The present research enumerates the process parameter optimization of TIG welding process with aluminium alloy 6061 (AA6061). The input parameters such as weld current, shielding gas flow rate and double ‘V’ groove angle have been considered in view of optimizing the output parameters such as tensile strength and hardness of the TIG-welded specimens. The experiments are conducted based on L9 orthogonal array. Grey relational analysis (GRA) has been employed to get the common optimal combination of considered input factors which yields better results for both the output responses. Optimal regression equations have been generated with the help of Design-Expert software. The influence of the input parameters on the output results has been analysed using ANOVA using Minitab software. 3D surface plots have been plotted to show the relationship between combinations of input factors with the output responses.