A Parametric Investigation of the Through-Thickness Residual Stresses in the Thick Weld Plate Considering Back Chipping: Neutron Diffraction and Finite Element Method

摘要

Neutron diffraction (ND) and finite element method (FEM) were combined to analyze the through-thickness residual stresses in the thick weld plate considering back chipping. The effect of back chipping width, the heat input of the back weld after back chipping, interpass temperature, and plate thickness on the residual stresses were conducted by FEM. The results showed that larger back chipping width could be helpful to decrease the risk of stress corrosion crack. With the decrease of heat input, the stress variation becomes more obvious. The longitudinal residual stresses decrease with the increase of interpass temperature. Nevertheless, the plate thickness has little influence on the residual stress distribution law. Based on the results of FEM, a formula focused on the 10-40 mm thick plates was fitted to calculate residual stresses with the change of depth through thickness, which was verified by ND measurement.