首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of the transport phenomena in GMAW using argon-helium mixtures. Part Ⅰ- The arc
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Modeling of the transport phenomena in GMAW using argon-helium mixtures. Part Ⅰ- The arc

机译:使用氩氦混合物对GMAW中的传输现象进行建模。第一部分-弧线

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摘要

This article presents a numerical investigation on the transient transport phenomena in the arc which include the arc plasma generation and interactions with moving droplets and workpiece for pure argon and three argon-helium mixtures (75% Ar + 25% He, 50% Ar + 50% He, and 25% Ar + 75% He) during the gas metal arc welding (GMAW) process. The results indicate that the arcs in various shielding gases behave very differently due to the significant differences in thermophysical properties, including the ionization potential and the electrical conductivity, thermal conductivity, specific heat, and viscosity at high temperatures. For the same welding power input, it was found the increase of helium content in the mixtures results in (1) the change of plasma arc shape from bell-like to cone-like and (2) the change of arc pressure distribution along the workpiece surface from Gaussian-like to flat-top with decreasing peak value. Detailed explanations to the physics of the very complex but interesting transport phenomena are given.
机译:本文对电弧中的瞬态传输现象进行了数值研究,其中包括电弧等离子体的产生以及纯氩气和三种氩氦混合物(75%Ar + 25%He,50%Ar + 50)与运动液滴和工件的相互作用。气体保护金属电弧焊(GMAW)工艺中,使用He(%He)和25%Ar + 75%He)。结果表明,由于热物理性质(包括电离电势和电导率,热导率,比热和高温下的粘度)的显着差异,各种保护气体中的电弧的行为差异很大。对于相同的焊接功率输入,发现混合物中氦含量的增加导致(1)等离子弧形状从钟形变为锥形,以及(2)沿工件的电弧压力分布变化从高斯型到平顶的表面,峰值减小。给出了对非常复杂但有趣的传输现象的物理学的详细解释。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第26期|p.5707-5721|共15页
  • 作者单位

    School of Energy Science and Engineering, Central South University, Changsha 410083, China,Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;

    Department of Mechanical Engineering, University of Bridgeport, Bridgeport, CT 06604, USA;

    School of Energy Science and Engineering, Central South University, Changsha 410083, China;

    Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;

  • 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

    GMAW; shielding gas; plasma arc; metal transfer;

    机译:GMAW;保护气体等离子弧金属转移;

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