Numerical simulation of metal vapor behavior in arc plasma
Numerical simulation of metal vapor behavior in arc plasma
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DOI：
10.1016/j.surfcoat.2008.06.079
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发表时间：
2008-08
影响因子：
5.4
通讯作者：
Kentaro Yamamoto;Manabu Tanaka;S. Tashiro;K. Nakata;K. Yamazaki;E. Yamamoto;Keiichi Suzuki;A. Murph
中科院分区：
文献类型：
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作者：
Kentaro Yamamoto;Manabu Tanaka;S. Tashiro;K. Nakata;K. Yamazaki;E. Yamamoto;Keiichi Suzuki;A. Murph
考虑到焊池表面金属蒸气对等离子体的污染，对氦气中的钨极气体电弧进行了建模。钨极气体保护焊的整个区域，即钨阴极、电弧等离子体和熔池，均使用统一的数值模型进行处理。粘度近似用于以氦气和铁蒸气的粘度来表示扩散系数。预测了温度、速度和铁蒸气浓度随时间变化的二维分布，以及大气压下 150 A 电弧电流的焊缝熔深随时间的变化。结果表明，钨极气体电弧中的热等离子体明显受到熔池表面铁蒸气的影响，并且等离子体中铁蒸气的浓度取决于熔池表面的温度。
A gas tungsten arc in helium is modeled taking into account the contamination of the plasma by the metal vapor from the weld pool surface. The whole region of gas tungsten arc welding, namely the tungsten cathode, arc plasma and weld pool, is treated using a unified numerical model. A viscosity approximation is used to express the diffusion coefficient in terms of the viscosities of the helium gas and the iron vapor. The time-dependent two-dimensional distributions of temperature, velocity and iron vapor concentration are predicted, together with the weld penetration as function of time for a 150 A arc current at atmospheric pressure. It is shown that the thermal plasma in gas tungsten arcs is markedly influenced by iron vapor from the weld pool surface and that the concentration of the iron vapor in the plasma is dependent on temperature of the weld pool surface.