Abstract:
In view of the welding residual stress, the finite element software ABAQUS was used to simulate the welded joint of thin sheet aluminum alloy under several groups of welding parameters. According to the EBSD data of welded joints under different welding parameters, the macroscopic model and the mesoscopic model were established respectively. In the mesoscopic model, the temperature field and residual stress field were calculated by the face-centered cubic model based on the crystal cell structure of aluminum alloy. On this basis, non-resonant vibration was used to reduce the residual stress. The changes of residual stress in the macroscopic model and the mesoscopic model with different initial crystal orientations were compared, and the influence of crystal orientations on the stress relief effect under the different initial stress was compared. Results showed that the residual stress reduction effect of the mesoscopic model was better than that of the macroscopic model. The polycrystalline model with large crystal orientation difference had the highest stress reduction effect. The mesoscopic model could effectively simulate the reduction of longitudinal residual stress, and it was in accordance with the experimental results.