Xinqi Yang

TL;DR: In this paper, two types of friction stir spot welding (FSSW) are applied to join the 5052-H112 aluminum alloy sheets with 1mm thickness and then the effect of the rotational speed and dwell time on microstructure and mechanical properties is discussed.

TL;DR: In this paper, the microstructure and mechanical properties of 7075-T6 aluminum alloy joints joined by refill friction stir spot welding (RFSSW) were investigated, and the fracture mechanisms were observed by SEM (scanning electron microscope).

TL;DR: In this article, the influence of process conditions (welding speed and joint combination) on defects (hook and voids) features and mechanical properties of joints were investigated in detail.

TL;DR: In this paper, the authors applied FSpW to join the 6061-T4 aluminum alloy sheet with 2mm thickness and found that the tensile/shear strength reached the maximum of 7117.0 and 4555.4 N at the welding condition of the rotational speed of 1500rpm and duration time of 4 s.

TL;DR: In this paper, the influence of root flaws on the fatigue strength and life of friction stir (FS) welds was investigated, and it was found that there was always existed flaws at the roots of FS welds because of unsuitable welding parameters and the vertical length of the flaws is about 0.31-0.33mm.