Abstract
Under the control of external longitudinal magnetic field, substantial changes happen to ordinary gas tungsten arc welding (GTAW) process. In this paper, mathematical models of fluid flow and heat transfer of external longitudinal magnetic field moving GTAW three-dimensional weld pool were established. Current density distribution on weld pool surface was obtained by probe method. Using the multi-coupled analysis function of finite element analysis software ANSYS, distributions of current density and magnetic field as well as fluid flow and heat transfer in three-dimensional moving weld pool were systematically investigated to understand and reveal the effect of external longitudinal magnetic field on liquid metal in moving GTA weld pool and also to supply basis for the application of external longitudinal magnetic field welding technology.
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