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H. Mohammadnia, S.m. Mousavizade, H.r. Ezatpour,
Volume 20, Issue 1 (1-2020)
Abstract
In this research, the effect of tool rotation speed and dwelling time on the strength of the welds produced by protrusion friction stir spot welding (PFSSW) was investigated. This simple novel technique involves the use of a designed circular protrusion on the backing anvil. Welding was performed by pinless tools on the AA5053 sheets with a thickness of 1 mm at tool rotation speeds of 630-2000 rpm and dwelling times of 6 s, 12 s, and 18 s. Appearance surface of produced welds was the smooth and free keyhole in comparison with conventional friction stir spot welding. Tensile-shear test results showed that all welds were failed in circumferential failure mode. Maximum and minimum peak loads were obtained at 1600 rpm, 18 s (4.9 kN) and 1000 rpm, 12 s (3.5 kN), respectively. Maximum and minimum elongations were obtained at 2000 rpm, 18 s (5 mm) and 2000 rpm, 6 s (2.3 mm), respectively. Maximum and minimum failure energies were obtained at 2000 rpm, 18 s (12.3 J) and 1000 rpm, 12 s (3.1 J), respectively.
