| The welding is a rapid and extremely physicochmemical metallurgical process. Welding pool is an important domain of welding simulation all along. In this paper, according to conservation of energy principle and technology characteristics of tungsten inert gas(TIG), a model of non-steady three-dimensional temperature field for T3 red copper's TIG welding with a locomotive arc was established. Discretization treating has been carried out on model with the method of finite element. The driving force of buoyancy, electromagnetic force and surface tension have been synthetically considered in the model. At the same time, the variation of temperature-dependent material thermophysics performance ,the energy change between welding pool and environment and the influence of melting/solidifying of phase changes for flow field and temperature field have also been considered.Indrafted the surface distribution dual-ellipsoid model, and the demands of welding numerical simulation was primely satisfied.The author studied the TIG welding of thick-wall red copper adopting Ar+N2 without preheating. Microstructure and mechanical properties of welding splice were also studied under different proportion of Ar+N2.According with characteristics of TIG welding pool temperature felid and flow felid, elements were divided by using non-uniform grid in the finite element software ANSYS. In this study, heat absorbing of TIG welding pool was treated by splicing heat source. And the math model was solved. Simulation results showed the creation of TIG transient welding pool. The effect of welding current and welding speed to temperature field distribution was calculated. Comparing the experiment value and the calculation value under different technological parameter, the results indicated that the model and practical course were well matched, proved that the model was reliable and correct.
|
PDF Full Text Request