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In this study, the effect of tool rotation speed on the mechanical and metallurgical properties of friction stir spot welded (FSSW) AA 7075-T6 aluminum alloy plates was investigated. Aluminum alloy plates were joined by FSSW using welding parameters consisting of three different rotation speeds of 1040, 1320 and 1500 rpm and a constant insertion depth of 3.2 mm. In spot welded specimens, the highest tensile strength value (6200 N) was obtained in plates welded at a tool rotation speed of 1500 rpm. The data obtained from the metallographic analysis are compatible with the tensile test results. Metallographic investigations demonstrated that there was a small amount of porosity in the welding zone of the specimens jointed at 1500 rpm.

The Effect of Tool Rotation Speed on Mechanical Properties of Friction Stir Spot Welded (FSSW) AA7075-T6 Aluminium Alloy Sheets