Tool travel speed effects on the microstructure of friction stir welded aluminum–copper joints

Friction stir welding of aluminum and copper were carried out by varying the tool travel speed from 50 mm/min to 90 mm/min. The joint properties were evaluated and characterized with respect to the stir zone formation, intermetallics formation and its distribution. Tool traverse speed of 70 mm/min and 80 mm/min resulted in the optimum range of heat input to form defect free stir zone. The reduced diffusion rate and time prevailing at tool...