Numerical simulation of S355JR-316L dissimilar metal welding

Considering the thermophysical properties of materials and the latent heat of phase change, the temperature field, HAZ microstructure evolution, residual stress and post-weld deformation of S355JR-316L dissimilar metals were numerically simulated using SYSWELD software and verified by experiments. After welding, the phase transition only occurs on the HAZ side of S355JR, in which the maximum content of martensite is 9.8%, the maximum content of residual austenite is 0.3%, and the remaining is bainite. Along the weld direction, the longitudinal and transverse residual stresses of S355JR and 316L appear near the weld centerline. The maximum longitudinal residual stress is 410 MPa, and 310 MPa, respectively, and the maximum transverse residual stress is 204 MPa, and 188 MPa, respectively. The overall deformation of the welded joint is V-shaped symmetrical with respect to the weld centerline. The deformation of S355JR is smaller than that of 316L, and the maximum edge deformation is 3.1 mm. The result of angular deformation is 4.1°. The overall deformation and angular deformation of welded joints welded with dissimilar steel are greater than those welded with the same steel.