Influence of different shapes on the mechanical properties of laser spot weld of TC4 titanium alloy

Four different shapes of weld are designed to execute the experiment of non-penetration welding of TC4 titanium alloy. Shear performance and fracture behavior of different welds are mainly researched. The shear performance has a relationship with the area of fusion surface. The double row of stitch weld has the highest shear performance. The weld will depart from the interface or break along the cross-section at the endpoints. The existence of the residual stress leads the stress concentrating at the endpoints and subsequently descends the static performance of C weld with respect to double row of stitch weld.