Multi-objective optimization of activated tungsten inert gas welding of duplex stainless steel using response surface methodology

Abstract

The effect of activated tungsten inert gas welding process parameters on the weld bead geometry of duplex stainless steel alloy 2205 is analyzed and discussed in this research paper. The welding design matrix for conducting the experiments is made using the central composite design of response surface methodology (RSM). The input process parameters (current, torch speed, and arc gap) are varied at five levels which results in 21 experimental trials. Bead-on-plate welds are made on 10-mm-thick duplex stainless steel plates. The responses (depth of penetration, area of depth of penetration, bead width, bead height, heat-affected zone width, and aspect ratio) are measured after conducting the experiments. A second-order response surface model is developed for predicting the responses for the set of given input parameters. Then, multi-objective optimization is performed to obtain the desired weld bead geometry using desirability approach.