| Welding is a complicated physicochemical process which involves in electromagnetism, heat transferring, metal melting and solidifying, Phase-change, Welding stress and deformation and so on. With the Rapid improvement of computer calculating ability and the advances of numerical calculation technique, numerical simulation with finite element analysis has become the most important means for welding distortion predictions.This paper systemically discusses the welding process via the finite element analytical system. We use the heat source model in SYSWELD to simulate the process of the laser welding based on stainless steel TCS345. First, based on the stainless steel weld experimental result, take application of FORTRAN to carry out second time tap when applied for different shape of weld seam is the advanced form when people use SYSWELD. By utilizing the results to simulate the welding process of butt welding. Meanwhile, the calculation results have little difference with test result. We can prove the heat source model is correct.Via the monitoring temperature system, some points in the test model are measured during welding process by means of thermocouples. As a result, the experimental data is in perfect accordance with calculated data. In conclusion, doing by this way can firmly provide a basis for further research of stress and strain fields in the period of welding process. The welding transversally and longitudinally residual stress and distortion were also measured on 6 mm thick plate. The distributive patterns of residual stresses matched extremely well with the results of numerical simulation as well as testify the results of the numerical simulation.As it can been manifested by the research and numerical stimulation, this paper establishes a feasible dynamic simulation method on 3D welding temperature and stress fields, which provides theory evidence and instruction and promotes the application of FEA on welding mechanics analysis and engineering.
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