Simulation Of Welding Temperature Field And Stress Field

Welding is a complicated physicochemical process which involves in electromagnetism, heat transferring, metal melting and freezing, phase-change welding stress and deformation and so on. In order to get high quality welding structure, these factors have to be controlled. If welding process can be simulated with computer, the best design, procedure method and optimum welding parameter can be obtained.Based on summing up other's experience, employing numerical calculation method, this paper researcher systemically discusses the finite element analytical system of the welding process by realizing the 3D dynamic simulation of welding temperature field and stress field, then uses the research result to simulate the welding process of board surfacing by FEM soft ANSYS. At the same time, the calculation result accords with traditional analysis result and theory result.The main contents of the paper are as following: the calculation in welding process is a material nonlinear procedure that the material properties change with the temperature; choose the function of Gauss as heat source model .use the function command to apply load of moving heat source. A mathematic model of transient thermal process in welding is established to simulate the moving of the heat source. The effects of mesh size, welding speed, welding current and effective radius electric arc on temperature field are discussed. The problem of the fusion and solidification of material has been solved by the method of changing the element material. The problem of the convergence difficulty or the un-convergence during the calculating of the thermal stress is solved; through real-time dynamic simulation of the stress produced in welding process, the thermal stress and residual stress in welding can be predicted by using the simulative analysis method in this paper.In this paper, a feasible dynamic simulation method on 3D welding temperature field, stress field had been established, which provides theory foundation and instruction on optimizing the welding technology and parameters.