Finite Element Simulation of Welding of Large Components Based on Inherent Strain and Thermo Elastic Plasticity

Based on inherent strain theory, it predicts and optimizes welding deformation of movable arm by means of welding numerical simulation. At the same time, based on thermal elastic-plastic theory, it predicts stress distribution, and finite element model is verified correctly by experiments. The results show that maximum deformation occurs at the front ear plate, and maximum unilateral deformation is 1.95mm. Compared with experimental results, error is about 11%, which proves the accuracy of simulation results. The best welding sequence is 1, 5, 4, 2, 3. Maximum deformation of front ear plate is reduced by 0.47mm, and welding deformation is reduced by 24.1%. Maximum stress is located at the intersection of reinforcing plate and lower cover, and peak value is 289.4MPa. Simulation results are in good agreement with experimental results, and error is controlled within 11.96%, which verifies the validity of finite element model.