激光-电弧-磁场多能场复合焊接数学模型
首发时间:2018-01-04
摘要:本文针对激光-电弧-磁场多能场复合焊接新工艺机理研究挑战,首次建立了多能场复合焊接三维数学模型,并开发了高效的数值模拟程序,率先实现了多能场复合焊接固-液-气-等离子体一体化三维可视化仿真。模拟预测结果与高速摄像结果一致。通过数值模拟研究,揭示了复合等离子体(电弧等离子体与金属蒸汽混合物)温度场、流动场、浓度场、电磁场的典型特征,发现了多能场焊接过程中独特的复合等离子体前后周期性振荡现象,并阐明了其物理机制。本文提出的数学模型和数值方法可为多能场复合焊接工艺和机理的定量研究提供理论工具。
关键词: 激光-电弧-磁场复合焊 数学模型 可视化仿真 复合等离子体 周期性振荡
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3D transient mathematical model of laser-arc-magnetic hybrid welding
Abstract:In this paper, focusing on the challenges of mechanism research in the new process of laser-arc-magnetic multi-energy fields hybrid welding, a three-dimensional mathematical model was the first to be proposed. The corresponding high-efficiency calculation program for direct numerical simulation was also developed. The three-dimensional visualized simulation of solid-liquid-vapor-plasma integration behaviors in the hybrid welding process was the first to be realized. The predicted results agree with the high-speed camera data. Through direct simulation, the typical characteristics of temperature field, flow field, concentration field, and electromagnetic field of hybrid plasma (the mixture of arc plasma and metallic vapor) was revealed. The special periodic oscillations of hybrid plasma in the welding speed direction was found, and its mechanism was also clarified. The proposed mathematical model and numerical methods can be served as a theoretical tool to quantitatively investigate the processing and mechanisms in multi-energy fields hybrid welding.
Keywords: laser-arc-magnetic hybrid welding mathematical model visualized simulation hybrid plasma periodic oscillation
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