Desirability function analysis based multi response optimization of process parameters during friction stir welding of AA6061-AA7075

Abstract

The goal of this work is to choose the best friction stir welding process parameters for the alloy AA6061-AA7075 based on a multi-criteria decision-making technique. The tool rotational speed, feed, and tilt angle were selected as the input parameters for the friction stir welding experiments, which were carried out using a L9 orthogonal array. The measured responses are tensile strength, hardness, and elongation percentage of a welded joint. The multi-criteria decision-making technique namely Desirability Function Analysis (DFA) is used to find the optimum process parameters combination. The optimum conditions are tool rotational speed of 710 rpm, feed of 30 mm/rev, and tilt angle at 2o.