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首页> 外文期刊>International Journal of Heat and Mass Transfer >Plasma arc and weld pool coupled modeling of transport phenomena in keyhole welding
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Plasma arc and weld pool coupled modeling of transport phenomena in keyhole welding

机译：等离子弧和熔池耦合的锁孔焊传输现象建模

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摘要

Plasma arc welding involves intricate thermal, electrical, magnetic and fluid dynamics phenomena. To date, tremendous research has been carried out on the weld pool or the thermal plasma arc separately. Yet few studies have integrated the both aspects, much less the keyhole effect in addition. Accordingly, as an endeavor to advance the understanding of the transport phenomena in keyhole welding with plasma arc, a unified model coupling plasma arc and weld pool has been developed to help gain access to the more complete knowledge of energy conversion in the thermal plasma process and heat transfer to the weld pool with the consideration of keyhole effect. By solving a series of governing equations that contain the mass, the momentum and the combined thermal, electric and magnetic energy, both temperature and velocity fields in the arc region and in the weld pool were exhibited. Results show that about 10% of plasma arc outflows from the keyhole exit. The heat conduction flux is more than two times of the electron condensation flux in the welding process. It is also found that the Marangoni shear takes obvious priority over the electromagnetic force, and two circular flows appear in the weld pool. Moreover, arc flows, electrical potential, current density and electromagnetic force were all predicted to further the understanding of thermal plasma process. Two velocity-transition points were found within the keyhole, from which the arc begins to flow outwards and upwards and finally outflows through the top metal surface. Finally, experiment was conducted on the stainless steel plate, and the measured weld pool is close to that calculated by our model.
机译：等离子弧焊涉及复杂的热，电，磁和流体动力学现象。迄今为止，已经分别对焊池或热等离子弧进行了大量研究。然而，很少有研究将这两个方面结合在一起，更不用说钥匙孔效应了。因此，为加深对等离子弧锁孔焊接中的传输现象的理解，已开发出耦合等离子弧和焊池的统一模型，以帮助获得热等离子过程中更完整的能量转换知识。考虑到锁孔效应，热量传递到焊池。通过求解一系列包含质量，动量以及热，电能和磁能的控制方程，可以显示电弧区域和焊缝中的温度场和速度场。结果表明，约有10％的等离子弧从锁孔出口流出。在焊接过程中，热传导通量是电子冷凝通量的两倍以上。还发现，Marangoni剪切比电磁力具有明显的优先级，并且在焊缝中出现了两个圆流。此外，还预测了电弧流，电势，电流密度和电磁力，以进一步理解热等离子体过程。在锁孔内发现两个速度转换点，电弧从该点开始向外和向上流动，最后通过顶部金属表面流出。最后，在不锈钢板上进行了实验，测得的熔池接近我们模型计算的值。

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  • 来源
  • 作者

    Yan Li; Yanhui Feng; Yafei Li; Xinxin Zhang; Chuansong Wu;

  • 作者单位

    State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;

    School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China;

    School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China;

    MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining, Shandong University, Jinan 250061, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Plasma arc welding; Unified model; Heat transfer; Keyhole effect; Weld pool; Electromagnetic effect;

    机译：等离子弧焊;统一模型;传播热量;锁眼效应;焊池电磁效应;

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