Effect of Heat Treatment on Mechanical Properties of Aluminum Alloy Butt Joint by Friction Stir Welding Process

Abstract

The objective of this research is to effect of heat treatment on mechanical properties of butt joint of aluminum alloy AA 6061, AA6063, AA7075 by friction stir welding. Tools made from JIS SKD11 steel. The round speed is 985 RPM. The 2 levels of welding speed; 74 mm/min and 89 mm/min, are welded by welding stir butt joint and annealing at 150, 200, 300 and 350 oC for 2 and 4 hours.

The result of the experiment shows that the welding speed 89 mm/min of aluminum alloy 6061, and 7075 with annealing temperature is 150 oC for 4 hours will make 193.16 N/mm2 which is the maximum tensile strength. The welding speed 89 mm/min of aluminum alloy 6061, and 6063 with annealing temperature is 150 oC for 4 hours will make 124.7 Hv which is the maximum hardness and the welding speed 74 mm/min of aluminum alloy 6061, and 6063 with annealing temperature is 350 oC for 2 hours will make 27.7% of Elongation which is the highest.