Numerical simulation of residual stress in unequal thickness welded joints of Q550E high-strength steel
Based on ABAQUS finite element software,a thermal-elastic-plastic finite element to calculate welding residual stress was developed.Using the developed calculation method,the magnitude and distribution of residual stress in unequal thickness welded joints of Q550E high-strength steel were studied.At the same time,the thermal cycle curve of the welding process and the distribution of residual stress after welding were measured by thermal cycle tester and XRD,respectively.The numerical simulation results were compared with the experiments to verify the accuracy of the finite element model.The results show that the peak value of longitudinal residual stress is close to the yield strength of the material.Because the test uses unequal thickness welded joints,the residual stress distribution of the welded parts is asymmetric.In addition,different welding materials significantly affect the peak stress magnitude and distribution of welded joints.