Abstract
This paper is aimed to study in detail about dissimilar welding of aluminium alloy (AA 1100) with mild steel (MS) of thicknesses 3.0mm and 2.0mm respectively. This paper also gives emphasis on the multi-objective optimization by using grey relational analysis (GRA) for samples welded with gas tungsten arc welding (GTAW). The welding input parameters are crucial in obtaining the desired weld quality. The experiments have been performed according to the L-8 orthogonal array.The input parameters chosen are the pulsed DC parameters such as pulsed current, base current, pulse on time percentage and frequency. The weld quality determining parameters are the ultimate tensile strength and rockwell hardness number. Grey relational analysis is used to obtain the optimum values of the input parameters for the optimum weld quality.
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