Effect of geometric shape of plate on residual stress and deformation distribution for butt-weld joint

This paper presents a numerical simulation of deformation and residual stress in butt-weld joint for different shaped plates．Within the framework of numerical investigation，3 types of models and a double ellipsoidal heat source were implemented in finite element simulation．As for an effect of geometric shape，the weld-induced deformation and residual stress should be taken into account during designing the welded structure．And for U －shape plates，the effect of curvature radius on the mechanical properties was also obtained，which is a significant factor affecting its service life．The simulation results revealed that the plate processed into U-shape could reduce the deformation and residual stress near the weld．And the deformation and residual stress in U－shape plate with circular arc transition were further reduced．Furthermore，the effect of curvature radius on the mechanical properties of plates was not general considered as the bigger curvature radius the better mechanical properties．The results concluded that the geometric shape significantly affects the mechanical properties，which provides prediction for structural design．