Effect of Tool Rotation Speed on Friction Stir Spot Welded AA5052-H32 and AA6082-T6 Dissimilar Aluminum Alloys

摘要

Friction stir spot welding (FSSW) is a solid-state metal joining process derived from friction stir welding. In this study, FSSW of AA5052-H32 and AA6082-T6 dissimilar aluminium alloys are performed at three different tool rotations specifically 1500, 1070, and 765 rpm. The other process parameters such as tool design, tool tilt angle, plunge depth, and axial force were held constant to investigate the effect of tool rotation on FSSW of dissimilar AA5052-H32 and AA6082-T6 alloys. Microstructural characterization and mechanical testing were carried out to evaluate the properties of weld joints. Microstructural examinations confirmed defect-free samples for all three tool rotation, while microindentation hardness and tensile-shear tests reported enhanced ultimate tensile strength as a mechanical property for high tool rotation speed of 1500 rpm.