Finite Element Modeling of Residual Stress in Weld Joint of Q890D High Strength Steel Medium and Heavy Plate

Distribution and value of residual stress in welded joint of Q890D high strength steel medium and heavy plate of 8 mm thick were analyzed by finite element modeling, and X-ray diffraction method and blind-hole method were used to verify. The results show that, longitudinal residual stress in the welded joint was compressive stress in arc starting and arc stopping positions, the middle parts was tensile stress and the value of peak stress was 823.4 MPa. With the increase of distance from weld seam, transverse residual stress gradually decreased, and it showed tensile stress. The simulated results were in good agreement with the measured results from X-ray diffraction method, the error between them was 17.4%, this proved the accuracy of the finite element model.