fme.02.2017.04.06

Dissimilar metal welding is widely used in machinery and equipment and a member of the petrochemical, aerospace, power plant boiler, engineering machinery industry. To study the residual stress in the multi-pass dissimilar metal welded joint, the welding process is simulated and analyzed by using ABAQUS software in this paper, which it is considered that the effect of the temperature, thermal convection, and radiation diffusion on the physical properties of the material. Meanwhile, the welding heat resource is simulated by an ellipsoidal heat source mode and the element birth-and-death technique and the sequential coupling approach is adopted in the simulation. The results indicate that the maximum residual stress appears in the weld metal region, which is beyond the yield stress of material, and the stress in the middle layer is less than the stress on the upper and lower surfaces in welded plate.