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An evolutionary keyhole-mode heat transfer model in continuous plasma arc welding

机译:连续等离子弧焊接中的进化锁孔模式传热模型

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摘要

Keyhole plasma arc welding is superior to other ordinary arc welding technologies in deep penetration welding. Energy can be transferred to bottom metal by hot plasma arc in keyhole rather than merely by heat conduction through whole thickness. Hence, an evolutionary keyhole-mode heat transfer model was developed to demonstrate this thermo-physical process. In view of the relative movement of plasma torch and workpiece, a double-elliptical heat source was set up on top surface and a developing conical heat source below, which is closely related to keyhole depth by Volume of Fluid method. Based on analogy to practical welding process, a dynamic energy distribution coefficient was established and an adjustment factor was introduced to account for pressure variation. According to numerical simulation, evolutionary energy propagation process, corresponding temperature field and molten pool geometry were demonstrated simultaneously. The dynamical keyholing process and the consequent keyhole-mode heat transfer and fluid flow were revealed in continuous keyhole plasma arc welding. Experiment was conducted on an 8 mm-thick stainless steel plate, and the measured weld geometry, keyhole size and keyhole exit deviation show reasonable agreement with calculated results.
机译:在深熔焊中,键孔等离子弧焊优于其他普通弧焊技术。能量可以通过锁孔中的热等离子弧转移到底部金属,而不仅仅是通过整个厚度的热传导。因此,开发了进化的锁孔模式传热模型来证明这种热物理过程。考虑到等离子炬与工件的相对运动,在其上表面设置了一个双椭圆形热源,在下面设置了一个正在发展的圆锥形热源,这与流体体积法与锁孔深度密切相关。在模拟实际焊接过程的基础上,建立了动态​​能量分配系数,并引入了一个调整系数来解决压力变化。通过数值模拟,同时论证了演化能量的传播过程,相应的温度场和熔池的几何形状。在连续的锁孔等离子弧焊中揭示了动态锁孔过程以及随之而来的锁孔模式传热和流体流动。在一块8 mm厚的不锈钢板上进行了实验,测得的焊缝几何形状,锁孔尺寸和锁孔出口偏差与计算结果显示出合理的一致性。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第2期|1188-1198|共11页
  • 作者单位

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

    School of Energy and Environmental 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 Energy and Environmental 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; Keyhole-mode heat source; Temperature field; Volume of fluid; Weld pool; Keyhole exit deviation;

    机译:等离子弧焊;锁孔模式热源;温度场液体量;焊池锁孔出口偏差;

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