Abstract
The effect of Friction Stir Welding settings on the microstructural and mechanical behaviour of a friction stir welded dissimilar aluminium alloy joint was explored experimentally in this work. Welded joints were processed via various profiled tool pin and two different tool rotational speeds of 1500 rpm and 2000 rpm. Welding speed of 40 mm/min was kept as constant. Welded joints microstructure, microhardness and tensile strength have been evaluated. Weld Stir Zone of the specimen fabricated with square pin profile exhibited homogeneous distribution of fine grains which yields the maximum tensile strength and hardness of 278 MPa and 102HV respectively when compared to other tool pins. Fine dimples in the sample 4 revealed the ductile mode of fracture in the weld machined with square pin tool.
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