Numerical Simulation of Multi-repaired Weld Residual Stress

摘要

In order to understand the change regulation of residual stress during multi- repaired welding to provide theoretical guidance for correct repaired welding procedure and improvement of joint properties, and to simulate the magnitude and distribution of residual stress using the finite element method ( FEM). A model of temperature field of weld-repaired using FEM, which was simplified, was established. The weld stress consists of thermal stress and organization stress. Models of the thermal stress and organization stress were described. ANSYS, a software of finite element, was applied, to calculate the stress, BHW35 steel was taken as an example, the simulated and experimental results for the 1st, 3rd and 5th weld- repaired were analyzed, the simulated results are in good agreement with experimental results. It can be concluded that the residual stress in the weld center changes little, and the high residual stress exists in HAZ. And in the same place, the more repaired weld, the higher residual stress, and the area of residual stress becomes wider.