Numerical Simulation on Temperature Field and Residual Stress Field of Cut Deal by Multi-pass Welding
The finite element analysis of temperature field and residual stress field in butt-welding of two 6mm thickness stainless steel plates was accomplished using ANSYS codes.A 3-demisional finite element model was set up during the calculation.The enthalpy and temperature dependence of material property were taken into consideration.The moving Gaussian heat source was used to simulate the welding heat cycle.The course of stuffing,melting,solidifying of metal in welding was successfully simulated with the birth-death element method.The thermal analysis shows the heat-affected zone is narrow and the temperature field is spindle-shaped distribution.The residual stress results show that,on a path perpendicular to the welding direction,the residual stress is typical W-shape distribution.The maximum of residual stress is longitudinal tensile stress,which almost reach the yield stress.The distribution of residual stress from the simulation agrees with the results from the welding theory.