Study on welding residual stress and distortion in Q345/SUS304 dissimilar steel butt weld of V and K groove type

Based on ABAQUS software, a computational approach was developed to simulate welding temperature field, residual stress distribution and deformation for Q345/SUS304 dissimilar steel multi-pass joint into groove shape of V and K type with 10 mm thickness. Meanwhile, experiments were carried out to measure welding residual stresses and angular distortion in the butt weld. Through comparing the simulated results with the measured data, we found that both residual stresses and angular distortion predicted by the numerical model were in good agreement with the experimental measurements. The simulation results show that the longitudinal residual stress distribution is discontinuous near the fusion line between Q345 and weld metal, and the region with high tensile stress in SUS304 side is wider than that in Q345 side. Comparing K groove welded joints of opening toward the Q345 side with opening toward the SUS304 side, the peak value of residual stress and the high tensile residual stresses near the intersection area of the Q345/weld were significantly smaller. The experimental and simulation results show that groove shape has prominent influence on angular distortion.