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Modeling of Molten Drop Oscillation in Gas shielded Metal Arc Welding

机译:气体保护金属电弧焊熔滴振荡的建模

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摘要

In Gas shielded Metal Arc Welding process, the molten drop at the electrode wire tip is detached and transferred into the weld pool by various driving forces, which have been discussed mainly focusing on gravity force, electro-magnetic force, surface tension force and plasma drag force. In this paper the oscillation phenomena of metal drop and their numerical model are described. The numerical model developed is an axial symmetrical 2D model which enables to calculate and visualize time-change of the drop shape and the flow in the drop using VOF-CSF method. The validity of the model is verified through the comparison between calculations and experiments using water drop. It is shown that the natural frequency of the pendant drop decreases with increase of the drop size. And the numerical simulation predicts that it is possible to detach the molten drop from the electrode wire by exciting the forced oscillation around the natural frequency with pulsed current.
机译:在气体保护金属电弧焊过程中,电极丝尖端处的熔滴通过各种驱动力分离并转移到焊池中,这些驱动力主要集中在重力,电磁力,表面张力和等离子体阻力上进行了讨论。力。本文描述了金属滴的振荡现象及其数值模型。开发的数值模型是轴向对称二维模型,该模型能够使用VOF-CSF方法计算和可视化液滴形状和液滴中流量的时间变化。通过使用水滴进行的计算和实验之间的比较,验证了模型的有效性。结果表明,悬垂液滴的固有频率随着液滴尺寸的增加而降低。数值模拟预测,通过用脉冲电流激发围绕固有频率的强制振荡,可以从电极丝上除去熔滴。

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