Numerical analysis of metal transfer in gas metal arc welding
Numerical analysis of metal transfer in gas metal arc welding
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DOI：
10.1007/s11663-003-0080-3
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发表时间：
2003-06
期刊：
影响因子：
--
通讯作者：
G. Wang;P. Huang;Yue Zhang
中科院分区：
文献类型：
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作者：
G. Wang;P. Huang;Yue Zhang
本文描述了模拟金属传输的数值程序，该模型将用于分析熔化极气体保护焊 (GMAW) 中涉及的传输过程。该模型中使用的高级计算流体动力学 (CFD) 技术包括用于求解不可压缩流体流动的两步投影法；用于捕获自由表面的体积流体 (VOF) 方法；以及用于计算表面张力的连续表面力（CSF）模型。通过假设熔滴自由表面上几种不同类型的电流密度分布来估计焊接电流产生的电磁力。基于高斯电流密度分布假设的模拟表明，从球状传输模式到喷雾传输模式的转变发生在很窄的电流范围内，并且在该过渡区域中分离液滴的尺寸不均匀。对计算结果的分析可以更好地理解这一物理过程。给出了计算结果与实验结果之间的比较。发现由高斯假设计算的结果与实验观察到的结果非常吻合。
The present article describes a numerical procedure to simulate metal transfer and the model will be used to analyze the transport processes involved in gas metal arc welding (GMAW). Advanced Computational fluid dynamics (CFD) techniques used in this model include a two-step projection method for solving the incompressible fluid flow; a volume of fluid (VOF) method for capturing free surface; and a continuum surface force (CSF) model for calculating surface tension. The electromagnetic force due to the welding current is estimated by assuming several different types of current density distribution on the free surface of the drop. The simulations based on the assumption of Gaussian current density distribution show that the transition from globular to spray transfer mode occurs over a narrow current range and the size of detached drops is nonuniform in this transition zone. The analysis of the calculation results gives a better understanding of this physical procedure. Comparisons between calculated results and experimental results are presented. It is found that the results computed from the Gaussian assumption agree well with those observed in experiments.