Research on friction stir spot welding with refilling by friction forming process of aluminum alloy with keyholefree

1060 aluminium alloy was friction stir spot welded with refilling by friction forming process to avoid the keyhole which was left at the end of welding by the conventional Friction Stir Spot Welding. The influence of rotating velocity on the microstructures and mechanical properties of the joint were studied. The results show that at the appropriate rotating velocity,the welded joint obtained by refilling has good appearance and no flying burr,which has higher shear capacity.