Study of the arc voltage in gas metal arc welding
Study of the arc voltage in gas metal arc welding
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熔化极气体保护焊电弧电压的研究
DOI：
10.1088/1361-6463/aaf588
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Lozano
中科院分区：
文献类型：
--
作者：
Kozakov;Uhrlandt;Reisgen;Willms;Sharma;Lozano
本文研究了脉冲熔化极气体保护焊（GMAW）中的电压降，着重分析了焊丝和电弧沿着电流路径不同截面的电压降及其与弧长和电流的关系。一个典型的脉冲GMAW工艺的低碳钢在每脉冲模式的一滴被认为是作为一个参考。电压和电流已被测量在实验中与固定的送丝速度为不同的电弧长度和自由丝长度。通过高速成像和图像处理，仔细研究了电弧和熔化的焊丝部分的随时间变化的几何形状。特别是，保护气体和金属蒸汽占主导地位的部分的电弧已被同时捕获，并得出结论的弧柱中的电流路径的长度。通过比较相同电流和不同弧长下的电压测量值，确定了阴极和阳极鞘层电压之和以及弧柱的平均电场强度。在350 - 650 A的脉冲电流下，鞘层电压从18 V增加到23 V，并且在弧柱中获得了大约1.1 V mm-1的平均电场，该平均电场几乎与电流无关。因此，电弧柱中的欧姆加热对总功率预算的贡献小于20%，而电极护套的贡献大于60%。
In this paper, the voltage drop in pulsed gas metal arc welding (GMAW) is studied, focussing on the contributions of the different sections of wire and arc along the current path and their dependence on arc length and current. A typical pulsed GMAW process of mild steel in the one drop per pulse modus is considered as a reference. Voltage and current have been measured in experiments with fixed wire feed speed for varying arc length and free wire length. The temporally changing geometry of the arc and the molten wire parts has been studied carefully by high-speed imaging and image processing. In particular, the shielding gas and the metal vapour dominated parts of the arc have been captured simultaneously, and conclusions on the length of the current path in the arc column have been drawn. Comparing voltage measurements for the same current and different arc lengths, finally, the sum of cathode and anode sheath voltages as well as the mean electric field strength of the arc column have been determined. Sheath voltages increasing from 18 to 23 V for pulse currents from 350 to 650 A and a mean electric field of about 1.1 V mm− 1 in the arc column, which is almost independent of the current, have been obtained. As a consequence, the Ohmic heating in the arc column contributes less than 20% to the overall power budget whereas the contribution of the electrode sheathes is larger than 60%.
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