Numerical Analysis of Heat Source Properties of Pulsed Tungsten Inert Gas Arc

概要

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The heat source properties of TIG arc strongly depend on composition of shielding gas. For example, since the arc column is constricted due to high specific heat, heat flux onto a base metal in case of CO2 TIG arc is higher than that of argon TIG arc. The heat source properties can be controlled also by current waveform. Pulsed TIG welding is suitable for back-bead welding and thin plate welding, because the heat flux onto the base metal can be controlled by adjusting peak / base current ratio and frequency. In this paper, numerical simulation result of the heat source properties of pulsed TIG arc for various shielding gas composition will be reported. As a result, it was found that the heat flux increased immediately after transition from base current to peak current because of the thermal pinch effect. Furthermore, in CO2, although the heat transport toward the anode by convective flow was seen, that in radial direction due to thermal conduction was smaller than that of argon because of influence of large specific heat.
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