Numerical Investigation on Welding Residual Stress and Out-of-Plane Displacement during the Heat Sink Welding Process of Thin Stainless Steel Sheets

摘要

The effect of trailing heat sinks on welding-induced deformation and residual stress was numerically simulated using the finite element analysis (FEA) in this study. A 3-D thermal elastic plastic finite element model using a 2 mm-thick 304 stainless steel sheet was developed to simulate heat sink welding. In the numerical simulations, the parameters of the heat sink welding, such as the distance between the welding heat source and the heat sink and the size of the heat sink are varied to compare the variation of out-of-plane displacement and residual stress. This numerical simulation indicated that compared to conventional welding, trailing heat sink welding showed, first, smaller deformation and residual stress, second, a significantly reduced out-of-plane displacement under optimal heat sink welding conditions, and third, a reduced overall residual stress developed although no significant differences were seen in the maximum values of welding residual stress.