Numerical Simulation On Residual Stress Fields And Temperature Fields Of Weld Joint In The Process Of Fusion Welding

The residual stress in welding structure can directly influence their ability of bearing loads. Therefore, it is an important subject which needs accurately estimate the residual stress in the process of welding in order to ensure the safety of the structure.This paper systemically discusses the welding process via the finite element analytical system-ANSYS, mainly concentrating on of the 3D dynamic simulation of welding temperature field and stress field, next utilize the results to simulate the welding process of butt welding. Meanwhile, the calculation results have little difference with traditional analysis result and theory value. All the investigations are for the coming simulation of goods wagon bogie, a key part in the train.The main contents of the paper are as following:(1) Studying the relational problems of numerical of welding process, such as the choice of welding heat models, meshing girding etc.(2) The application of ANSYS Parametric Design Language to carry out second time tap is the advanced form when people use ANSYS. In this paper, what ANSYS' APDL does is to compile program for employing load of moving heat source.(3) 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.(4) The welding residual stress and distortion were also measured. 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 practical verify, 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.