Standardized width of tensile and fatigue specimens of laser lap welded joints considering residual stress

The shear strength and fatigue strength are important mechanical properties of the laser lap welded joints. However, no standard has regulated the dimensions of the tensile and fatigue specimens. In this paper, the reasonable widths of the laser lap welded specimens were determined by taking account of the residual stress. The shear strengths of specimens with residual stress and without residual stress were studied. It was found that the residual stress reduced the shear strength of the laser lap welded joints by change the stress state and micro-deformation uniformity.