Effect of rotational speed on forming and tensile shear properties of 2060 Al-Li RFSSW joint

This study chose 2060 Al-Li alloy as the objective to perform RFSSW experiments. The purpose is to investigate the rotational speed on interior form and tensile shear properties of RFSSW joint. The results show that the incomplete refilled defect, void and hook occur in the RFSSW joints under different rotational speeds. Furthermore, the incomplete refilled defect and void easily occur at low and high rotational speeds. Meanwhile, hook bends toward downward and its height first increases and then reduces. The tensile shear load of joint increases and then decreases with increasing rotational speed. The maximum value reaches to 9 800 N under 2 200 r/min. The fracture mode of RFSSW joint is shear fracture, and the fracture location includes three types. They are along the lap interface, along the bottom of the sleeve affected zone and along the above-mentioned mixture fracture.