Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon
Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon
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DOI：
10.1007/s40194-016-0362-4
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发表时间：
2016-06
影响因子：
2.1
通讯作者：
M. Hertel;S. Rose;U. Füssel
中科院分区：
文献类型：
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作者：
M. Hertel;S. Rose;U. Füssel
熔化极气体保护焊（GMAW）的工艺性能主要取决于电弧特性和材料过渡。近年来，数值方法被越来越多地用于理解气体保护焊中电弧与材料过渡之间的复杂相互作用。在本文中，我们总结了一个过程来描述电弧和熔化和蒸发电极之间的相互作用。随后，所提出的数值模型被用来研究在氩气中的低碳钢脉冲GMAW过程的电弧特性和金属过渡。数值模拟的结果进行了比较，OES测量以及高速图像在不同的时间在脉冲周期，并显示出良好的协议。结果表明，在大电流阶段，改变蒸发率在线电极处的电弧附着上有很大的影响。它可以被示出的电流的相当大的一部分不参与线电极的收缩通过所产生的洛伦兹力，这解释了在氩气保护气体中的低碳钢的脉冲GMAW工艺中的几乎无飞溅的液滴分离。
The process capability of gas metal arc welding (GMAW) processes is mainly determined by the arc properties and the material transfer. In recent years, numerical methods are being used increasingly in order to understand the complex interactions between the arc and material transfer in gas metal arc welding. In this paper, we summarize a procedure to describe the interaction between an arc and a melting and vaporizing electrode. Thereafter, the presented numerical model is used to investigate the arc properties and the metal transfer for a pulsed GMAW process of mild steel in argon. The results of the numerical simulation are compared with OES measurements as well as high-speed images at different times in the pulse cycle and show excellent agreement. The results illustrate the high influence of the changing vaporization rate on the arc attachment at the wire electrode in the high current phase. It could be shown that a substantial part of the current does not participate in the constriction of the wire electrode via the resulting lorentz force which explains the nearly spatter-free droplet detachment in pulsed GMAW processes of mild steel in argon shielding gas.