Numerical simulation of heat source properties of pulsed tungsten inert gas arc

Transactions of JWRI Pub Date : 2010-12-01 DOI:10.2207/QJJWS.29.9S

Kuniyoshi Ito, S. Tashiro, Manabu Tanaka

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Abstract

The heat source properties of TIG arc strongly depend on composition of shielding gas. For example, since the arc column is constricted due to low electrical conductivity of the helium arc, heat flux onto a base metal in case of helium 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. A number of results on experimental and theoretical investigations of the heat source properties of DC TIG arc have been reported. However, those of pulsed TIG arc are still not fully understood because of the complexity of the phenomenon. 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, temperature distribution of helium arc changes following change in current immediately due to high thermal conductivity

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脉冲钨惰性气体电弧热源特性的数值模拟

TIG电弧的热源性能在很大程度上取决于保护气体的成分。例如，由于氦弧的导电性较低，弧柱被压缩，因此氦TIG弧的热流到贱金属上的热流比氩TIG弧的热流高。热源的特性也可以通过电流波形来控制。脉冲TIG焊适用于背焊和薄板焊接，因为可以通过调节峰值/基极电流比和频率来控制基材上的热流密度。对直流TIG电弧的热源特性进行了大量的实验和理论研究。然而，由于脉冲TIG电弧现象的复杂性，人们对脉冲TIG电弧的特性还没有完全了解。本文报道了不同保护气体成分下脉冲TIG电弧热源特性的数值模拟结果。结果发现，由于热捏效应，从基极电流到峰值电流转换后，热流通量立即增加。此外，由于热导率高，氦弧温度分布随电流变化而变化

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