Energy propagation in plasma arc welding with keyhole tracking
Energy propagation in plasma arc welding with keyhole tracking
复制标题
带小孔跟踪的等离子弧焊中的能量传播
DOI：
10.1016/j.energy.2013.11.018
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发表时间：
2014
期刊：
影响因子：
9
通讯作者：
Wu C S
中科院分区：
文献类型：
--
作者：
Li Yan;Feng Y H;Zhang X X;Wu C S
建立了一个三维数学模型来研究等离子弧焊接过程中能量传播与小孔演化之间的动态交互作用。特别地，提出了小孔跟踪热源模型来反映小孔演化过程中的能量传播，并用VOF(Volume Of Fluid)技术进行了跟踪。该模型由顶面高斯型热流密度和与小孔动态生长相关的下层锥形热源组成。此外，还首次建立了与锁孔过程相结合的动态能量分配系数。该换热模型的设计引入了与实验中实际能量传播的类比。详细分析了考虑小孔效应的动态能量密度分布的演化过程，计算并显示了相应的温度场，揭示了工件内部的热过程机理。此外，还研究了小孔形成过程和熔池中熔体的流动情况，揭示了小孔对深熔焊接的促进作用。最后，在不锈钢板材上进行了实验，所测得的焊缝几何形状、小孔尺寸和工件完全穿透的时间均与模拟结果接近。
A three dimensional mathematical model was developed to research the dynamic interaction between energy propagation and keyhole evolution in PAW (Plasma Arc Welding). Particularly, a keyhole-tracking heat source model was proposed to reflect the energy propagation in the wake of keyhole evolution, which was tracked by the VOF (Volume of Fluid) technique. The model consists of a Gaussian heat flux on top surface and a lower developing conical heat source related to the dynamic keyhole growth. In addition, a dynamic energy distribution coefficient was established, bound up with the keyholing process for the first time. The design of this heat transfer model introduces the analogy to actual energy propagation in experiment. Evolution of the dynamic energy density distribution concerning keyhole effect was analyzed in details, and the corresponding temperature field was calculated and displayed to reveal the mechanism of thermal process in the workpiece. Furthermore, the keyholing process and molten metal flow in the weld pool were investigated to exhibit how the keyhole promotes the deep penetration welding. Finally, the experiments were carried out on the stainless steel plate, and the measured weld bead geometry, keyhole size and time for workpiece completely penetrated through were all close to simulation results.
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中等厚度不锈钢板小孔等离子弧焊控制系统
影响因子：
2.2
作者：
Wu, C. S.;Jia, C. B.;Chen, M. A.
通讯作者：
Chen, M. A.
影响因子：
2.3
作者：
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DOI：
10.1016/j.ijheatfluidflow.2013.01.006
发表时间：
2013-04
影响因子：
2.6
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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