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To investigate the effects of strain hardening, strain softening and dynamic balance behaviors of 2A12-T4 aluminum alloy on the welding residual plastic strain and residual stresses, the true stress-true strain curves at different temperature of certain material were used in the FEM modeling process. The simulation results show that little influence on the welding residual plastic strain and residual stresses was found as the strain hardening, strain softening and dynamic balance worked together.