Arc-cathode attachment in GMA welding
Arc-cathode attachment in GMA welding
复制标题
GMA 焊接中的电弧阴极附件
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
U. Reisgen
中科院分区：
文献类型：
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作者：
O. Mokrov;M. Simon;Rahul Sharma;U. Reisgen
提出了一种熔化极气体保护焊过程中的弧阴附着模型。它考虑了在非耐火铁阴极情况下的阴极加热，假定由于冷金属蒸气导致局部等离子体温度降低。它以等离子体体温和阴极降电压为自由参数，给出了阴极表面温度低于沸腾温度时的最大热流密度和电流密度。给出了热源描述在熔池模拟中的适用性，并计算了阴极的温度场，得到了热流密度和电流密度的分布，这与通常使用的轴对称高斯分布有很大的不同。阴极表面最高温度低于沸腾温度，这与观察到的结果一致。
A model for arc-cathode attachment in gas metal arc welding is presented. It considers the cathodic heating in the case of a non-refractory iron cathode, with the assumption of the lowering of the local plasma temperature, due to cold metal vapor. It takes the plasma bulk temperature as well as the cathode drop voltage as free parameters and it gives a maximum of heat flux and current density for a cathode surface temperature below boiling temperature. The applicability as a heat source description in a weld pool simulation has been shown, and the temperature field of the cathode was calculated, giving rise to heat flux and current density distributions, which differ significantly from the converntionally used axisymmetric Gaussian distribution. The maximum cathode surface temperature was lower than boiling temperature, which is in agreement with the observeration.