Cathode fall voltage of TIG arcs from a non-equilibrium arc model
Cathode fall voltage of TIG arcs from a non-equilibrium arc model
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DOI：
10.1007/s40194-014-0188-x
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发表时间：
2014
影响因子：
2.1
通讯作者：
D. Uhrlandt;M. Baeva;A. Pipa;R. Kozakov;G. Gött
中科院分区：
文献类型：
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作者：
D. Uhrlandt;M. Baeva;A. Pipa;R. Kozakov;G. Gött
这项工作提出了关于钨极惰性气体（TIG）焊接电弧的建模结果。该模型提供了一个一致的描述自由燃烧电弧，电弧附件和电极。考虑了整个电弧区的热不平衡和化学不平衡，并建立了阴极空间电荷鞘层的详细模型。在阴极预鞘的机制处理的框架内的非平衡态的方法，这是基于一个双流体描述的电子和重粒子和简化的等离子体化学的氩气。实现了电极跌落电压和温度分布的一致确定。该模型适用于电弧在纯氩气中的电流高达250 A，从而焊接的工件由低碳钢与固定的燃烧器被认为是。分别在50和250 A下获得12至17 V范围内的电弧电压。空间电荷鞘层电压约为7 V，几乎与电流无关。阴极尖端的相应温度在3，000K至约3，800K的范围内。所得到的结果与测量值符合得很好。
This work presents modelling results concerning a tungsten inert gas (TIG) welding arc. The model provides a consistent description of the free burning arc, the arc attachment and the electrodes. Thermal and chemical non-equilibrium is considered in the whole arc area, and a detailed model of the cathode space-charge sheath is included. The mechanisms in the cathode pre-sheath are treated in the framework of a non-equilibrium approach which is based on a two-fluid description of electrons and heavy particles and a simplified plasma chemistry of argon. A consistent determination of the electrode fall voltages and temperature distributions is achieved. The model is applied to arcs in pure argon at currents up to 250 A, whereby welding of a workpiece made of mild steel with a fixed burner is considered. Arc voltages in the range from 12 to 17 V are obtained at 50 at 250 A, respectively. The space-charge sheath voltage is found to be about 7 V and almost independent of the current. The corresponding temperatures of the cathode tip are in the range from 3,000 K to about 3,800 K. The results obtained are in a good agreement with measurements.