AA5083 and AA6061 Aluminium Alloys Friction Stir Welding: Multi Response Optimisation of Process Parameters Using the TOPSIS Approach

This work is an attempt to select the optimum process parameters for friction stir welding of AA5083-AA6061 alloy based on multiple criteria decision making approach. The friction stir welding experiments have been conducted according to L9 orthogonal array with chosen input parameters are tool rotational speed, feed and tilt angle. The responses measured are tensile strength, hardness and % of elongation of welded joint. The multi criteria decision making technique namely Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) is used to find the optimum process parameters combination. The optimum conditions are tool rotational speed of 710 rpm, feed of 50 mm/rev and tilt angle at 2o.