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Modelling and visualisation of droplet detachment in GMA welding

机译：GMA焊中熔滴分离的建模和可视化

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For the gas metal arc welding (GMAW) process, a computational module for axisymmetric transient numerical analysis was developed to simulate the phenomena of electrode melting; the droplet formation, detachment and transfer. During simulation, argon plasma and steel filler metal with diameter 1.2 mm were considered. Weld pool dynamics and cathode processes were not considered within this work. The transient melt flow velocities and temperature distributions in the droplet were calculated. The predicted droplet detachment and flight trajectory are in good agreement with published data. One of the main goals of presented work is to verify the VOF-approach for using in future work for GMAW simulation. It was shown that the droplet transfer depends on the transient distributions of current density, while the current density depends on droplet temperature, metal evaporation from droplet surface, plasma temperature and plasma pressure, etc.
机译：对于气体保护金属极电弧焊（GMAW）工艺，开发了用于轴对称瞬态数值分析的计算模块，以模拟电极熔化现象。液滴的形成，分离和转移。在模拟过程中，考虑了直径为1.2 mm的氩等离子体和钢填充金属。这项工作未考虑熔池动力学和阴极工艺。计算了液滴中的瞬时熔体流动速度和温度分布。预测的液滴分离和飞行轨迹与已发布的数据非常吻合。提出的工作的主要目标之一是验证用于将来的GMAW模拟工作的VOF方法。结果表明，液滴的转移取决于电流密度的瞬态分布，而电流密度取决于液滴的温度，液滴表面的金属蒸发，等离子体温度和等离子体压力等。

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