A dynamic model of droplet formation in GMA welding
A dynamic model of droplet formation in GMA welding
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DOI：
10.1088/0965-0393/20/4/045003
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
O. Semenov;V. Demchenko;I. Krivtsun;U. Reisgen;O. Mokrov;A. Zabirov
中科院分区：
文献类型：
--
作者：
O. Semenov;V. Demchenko;I. Krivtsun;U. Reisgen;O. Mokrov;A. Zabirov
对不同的方法进行了比较分析，这些方法从数学上描述了气体保护金属极电弧焊（GMA）过程中电极中金属熔滴的形成过程。结果表明，液滴自由表面的流体静力学模型不能正确地描述电极金属液滴的形成和转移。完整的流体动力学模型，它使用整个系统的Navier-Stokes方程，需要大量的计算机资源的数值实现。这就限制了它在小型计算实验中的应用。作为该模型的替代方案，考虑了适合于GMA焊接条件的近似流体动力学模型。它示出，该模型允许预测的液滴的几何形状的权利，其分离。研究了焊接电流和磁压力对熔滴尺寸和脱落频率的影响。
A comparative analysis of different approaches is carried out, which mathematically describes the metal droplet formation process in an electrode during gas metal arc (GMA) welding. It was shown that a hydrostatical model of the droplet's free surface could not correctly describe the formation and transfer of electrode metal droplets. The complete hydrodynamic model, which uses the whole system of Navier–Stokes equations, requires significant computer resources for numerical realization. This limits its application to small computational experiments. As an alternative for this model, the approximate hydrodynamic model adapted to GMA welding conditions is considered. It is shown that this model allows the prediction of droplet geometry right up to its detachment. The influence of the welding current and magnetic pressure on the droplet size and detachment frequency is studied.