Effect of parametric study on microstructure during FSW process

Abstract

Abstract The work focuses on the improvement of strength-weldability combination in Friction Stir Welding (FSW) joint of 7075 and 6061 Aluminium Alloys. Although Al-6061 and Al-7075 both are heat treatable but they are having somewhat different mechanical properties. The 7075-T6 has more tensile strength and hardness than that of 6061-T6.The lower hardness of 6061-T6 allow it to weld easily whereas 7075 prone to cracking during welding. Owing with the result that FSW could play significant role in order to improve the weldability, microstructure of cross section as well as the mechanical properties of joint was characterized. The welds were considered by using three rotational speed and three feed. It was revealed that the tensile strength of the joint (153.13 MPa) became very less in comparison to the base metal and it has been decreased again when the speed decreases from 700rpm and 15mm/sec to 2000rpm and 25mm/min.The findings such as tensile strength as well as the fracture revealed that mechanical properties and the microstructure of welding are not desirable for any structural application.