Impacts of Welding Heat Sources on Welding Stress of Steel Structure
Based on the Von Mises yield criterion and the linear isotropic hardening rule, a dynamic model of TIG welding 316L stainless steel was establish using the elastoplastic constitutive equations, and the effects of different welding heat source model on the distribution of temperature and residual stress in welding process were investigated. The results show that the isotherm is more inclined to long strip in the double ellipsoidal model, and the temperature gradient is small along the welding direction; the isotherm is relatively more round in 3D conical Gaussian heat source model, and the temperature gradient is larger along the welding direction; the residual stress distribution in the transverse and longitudinal direction is almost the same in two kinds of heat source models.