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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Two-dimensional time-dependent modelling of fume formation in a pulsed gas metal arc welding process
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Two-dimensional time-dependent modelling of fume formation in a pulsed gas metal arc welding process

机译：脉冲气体金属电弧焊过程中烟雾形成的二维时变模型

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摘要

Fume formation in a pulsed gas metal arc welding (GMAW) process is investigated by coupling a time-dependent axi-symmetric two-dimensional model, which takes into account both droplet detachment and production of metal vapour, with a model for fume formation and transport based on the method of moments for the solution of the aerosol general dynamic equation. We report simulative results of a pulsed process (peak current = 350 A, background current 30 A, period = 9 ms) for a 1 mm diameter iron wire, with Ar shielding gas. Results showed that metal vapour production occurs mainly at the wire tip, whereas fume formation is concentrated in the fringes of the arc in the spatial region close to the workpiece, where metal vapours are transported by convection. The proposed modelling approach allows time-dependent tracking of fumes also in plasma processes where temperature-time variations occur faster than nanoparticle transport from the nucleation region to the surrounding atmosphere, as is the case for most pulsed GMAW processes.
机译：通过将考虑液滴飞散和金属蒸气产生的时间相关轴对称二维模型与烟雾形成和传输模型耦合，研究了脉冲气体金属电弧焊（GMAW）工艺中的烟雾形成基于矩量法的气溶胶一般动力学方程的求解。我们报告了直径为1 mm的铁丝，带有Ar保护气体的脉冲过程的仿真结果（峰值电流= 350 A，背景电流30 A，周期= 9 ms）。结果表明，金属蒸气的产生主要发生在焊丝尖端，而烟尘的形成则集中在靠近工件的空间区域中的电弧边缘，在此处金属蒸气通过对流传输。所提出的建模方法还允许在等离子体过程中进行烟雾的时间依赖性跟踪，在等离子体过程中，温度-时间变化的发生速度要比纳米粒子从成核区域到周围大气的传输速度快，这与大多数脉冲GMAW过程一样。

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