Abstract
AA6063 and AA5052 plates are welded together with the help of friction stir welding (FSW). Experiments are performed based on the Box-Behnken experimental design (BBD) because this design minimizes the number of experimental runs required and reduces the time and resources needed for experimentation. The four factors (Tool Rotational Speed (TR), Welding Speed (WS), Pin Depth (PT), and Pin Offset (PO)) are selected as input responses to perform welding operation. TOPSIS method is well-suited for situations where decisions must be made based on several conflicting criteria, making it applicable to evaluate welding factors on mechanical properties. The multi-response optimization for output responses uses the BBD-based TOPSIS method. The optimal combination for higher tensile strength, hardness, and lower wear rate is at TR1-WS2-PO1-PT2 condition, and the value of multi-optimized output responses are found to be 201.96 MPa, 90.5 HV, and 0.00329m³ N^-1 m^-1, respectively.

Key words
Friction Stir Welding (FSW), multi-response optimization, Box-Behnken experimental design (BBD), TOPSIS and SEM analysis

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