Time Dependent Numerical Analysis of Stationary GTA Welding Process(Physics, Processes, Instruments & Measurements)

概要

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A development of a numerical model of GTA welding process is useful for understanding the heat transfer phenomena in the process and clarifying those effects on the weld penetration geometry. This paper presents results for the stationary argon GTA welding process at the atmospheric pressure. The whole region of the welding process, namely, tungsten cathode, arc plasma and stainless steel anode is treated in a unified numerical model to take into account the close interaction between the arc plasma and the molten anode. The time dependent two-dimensional distributions of temperature and velocity in the whole region of the welding process are predicted at a current of 150A. The weld penetration geometry as a function of time is thus predicted. It is shown also that calculated convective flow in the weld pool is mainly dominated by the drag force of the cathode jet and the Marangoni force as compared with the other two driving forces, namely, the buoyancy force and the electromagnetic force.