Numerical Analysis of the Metal Transfer and Welding Arc Behaviors in Underwater Flux-cored Arc Welding
Numerical Analysis of the Metal Transfer and Welding Arc Behaviors in Underwater Flux-cored Arc Welding
复制标题
水下药芯焊丝电弧焊金属过渡和焊接电弧行为的数值分析
DOI：
10.1016/j.ijheatmasstransfer.2020.119570
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发表时间：
2020-06
影响因子：
5.2
通讯作者：
Wu Chuansong
中科院分区：
文献类型：
--
作者：
Xing Changjian;Jia Chuanbao;Han Yanfei;Dong Shengfa;Yang Jie;Wu Chuansong
基于VOF方法，建立了水下湿法药芯焊丝焊接熔滴和电弧行为耦合的三维数值分析模型，模拟了水下湿法药芯焊丝焊接熔滴过渡和电弧等离子体流动过程。分析了熔滴形状与温度、电磁力、电流密度等物理量之间的关系。事实证明，特殊的电弧等离子体成分是电弧集中在熔滴底部而不是被包裹的主要原因。随着熔滴体积的增加，电弧温度降低。电弧形状的收缩导致焊接电流从熔滴底部一小块区域进入下弧。因此，在阳极斑点处形成强烈的电磁斑点力。液滴还受到气泡内的气流阻力的影响。在点力和气流阻力的共同作用下，熔滴过渡的主要方式是大滴排斥过渡。为了验证模型的可靠性，采用高速摄像机对熔滴过渡过程进行了实时拍摄，实验值与模拟值吻合较好。
Based on the VOF method, a three-dimensional numerical analysis model coupling both droplets and arc behaviors is developed to simulate the metal transfer and arc plasma flow processes in underwater wet flux-cored arc welding. The relationships between several physical quantities such as droplet shape and temperature, electromagnetic force and current density of droplets and arc at different periods are analyzed. As it turns out, the special arc plasma component is the main reason why the arc concentrates on the bottom of the droplet, rather than being wrapped. As the volume of the droplet increases, the arc temperature decreases. The constriction of arc shape leads to the result that the welding current flow goes through from the droplet bottom–a small area to subjacent arc. Therefore, at the anode spot an intense electromagnetic spot force is formed. The droplets are also affected by the gas flow resistance inside the bubble. Under the combinative actions of the spot force and the gas flow resistance, the main mode of droplet transfer is large droplet repelled transfer. For verifying the reliability of the model, the real-time metal transfer process is captured by a high-speed camera, the experimental values and the simulated values are found to be in good agreement.
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