OPTIMIZATION OF FRICTION STIR WELDING PARAMETERS DURING WELDING DISSIMILAR ALUMINIUM ALLOYS

The requirement of dissimilar metal welding is the most focused technology for the present-industrial applications likes nuclear power plants, aerospace components, and etc. Welding of different aluminium grades has spread the extent of applications into lightweight, non-corrosive and strength to weight ratio products. As the weld joint should have adequate strength for efficient use proper method, design and parameters section is mandatory. Friction Stir welding for welding, Taguchi for experimental design and Grey relation Analysis for parameter optimization are carried out in this investigation multi-response optimization of welding characteristics to join AA6061- T6 to AA7075-T6 aluminium alloys. To weld quality the responses such as ductility, hardness and tensile strength are optimized for process parameters are tool rotation ,welding speed and tool geometry. The derived optimal welding conditions are taper hexagonal pin profile,The tool rotation speed of 1200 rpm, and welding speed of 12 mm/min