Numerical simulation analysis of welding residual stress on dissimilar metal welded pipes

Welding residual stresses in 0Cr18Ni9/20 and 1Cr5Mo/20 dissimilar metal welded joints were simulated and analyzed with the finite element ABAQUS based on the succession coupling thermal stress computation program.The simulation results show that the maximum axial residual stress and hoop residual stress exist in the heat-affected zones(HAZ) of 20 steel side, and the minimum residual stress exists in 0Cr18Ni9 steel HAZ side.When 0Cr18Ni9/20 and 1Cr5Mo/20 dissimilar metal were welded by using the Incone182 nickel-base weld metal, the welding residual stresses were significantly reduced, which improves the resistance on stress corrosion cracking.