The Effect of the AA7075 Interlayer on the Microstructure and Mechanical Properties of the AA1050 Butt Joint Welded by FSW

In this research, the FSW Butt joint of commercial aluminum 1050 was investigated by using the 7075 aluminum alloy interlayer on the linear velocity of 30, 50 and 100 mm / min, and rotational speeds of 800 and 1200 rpm. A threaded cylindrical tool was used for joining of the 5 mm sheets. The OM, SEM, microhardness and tensile tests were done. The results shows that in sample with an interlayer at the condition of the 800 rpm and 30 mm/min the maximum tensile strength and hardness appeared and in the non-layered sample at the 800 rpm and 50 mm/min, the maximum tensile strength and hardness was obtained. The results shows that by using the interlayer the tensile strength and hardness were increase.