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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Investigation of molten pool oscillation during GMAW-P process based on a 3D model
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Investigation of molten pool oscillation during GMAW-P process based on a 3D model

机译:基于3D模型的GMAW-P过程中熔池振荡的研究

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In order to better reveal the oscillation mechanism of the pulsed gas metal arc welding (GMAW-P) process due to an alternately varied welding current, arc plasma and molten pool oscillation were simulated through a self-consistent three-dimensional model. Based on an experimental analysis of the dynamic variation of the arc plasma and molten pool captured by a high-speed camera, the model was validated by comparison of the measured and predicted results. The calculated results showed that arc pressure was the key factor causing the molten pool to oscillate. The variation in arc size and temperature from peak time to base time resulted in a great difference in the heat input and arc pressure acting on the molten pool. The surface deformation of the molten pool due to the varying degrees of arc pressure induced alternate displacement and backflow in the molten metal. The periodic iteration of deeper and shallower surface deformation, drain and backflow of molten metal caused the molten pool to oscillate at a certain frequency. In this condition, the arc pressure at the peak time is more than six times higher than that at the base time, and the maximum surface depression is 1.4 mm and 0.6 mm, respectively, for peak time and base time.
机译:为了更好地揭示由于交替变化的焊接电流而引起的脉冲气体保护金属电弧焊(GMAW-P)过程的振荡机理,通过自洽三维模型模拟了电弧等离子体和熔池振荡。基于高速相机捕获的电弧等离子体和熔池动态变化的实验分析,通过比较测量结果和预测结果验证了该模型。计算结果表明,电弧压力是引起熔池振动的关键因素。从峰值时间到基本时间,电弧大小和温度的变化导致作用在熔池上的热量输入和电弧压力的巨大差异。由于电弧压力的变化程度,熔池的表面变形会引起熔融金属的交替位移和回流。表面变形的深与浅,熔融金属的排出和回流的周期性迭代导致熔池以一定频率振荡。在这种情况下,峰值时间的电弧压力比基准时间的电弧压力高六倍以上,并且峰值时间和基准时间的最大表面凹陷分别为1.4 mm和0.6 mm。

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