Numerical Characteristics of Friction Stir Spot Welds

As a solid state joining process, friction stir spot welding (FSSW) has a strong potential to be applied in the aerospace and automotive industries. Mechanical property of the FSSW joint takes important influence on connection performance. In the present paper, numerical simulation model of mechanical property of the friction stir spot welds is established, based on the study of the microstructure of the joint. Stress distribution and deformation under tensile shear loads was obtained, and the failure mechanism is investigated. Research results can provide guidance for welding quality improvement of the FSSW joints.