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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Numerical Analysis for Weld Formation Using a Free-Burning Helium Arc at Atmospheric Pressure
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Numerical Analysis for Weld Formation Using a Free-Burning Helium Arc at Atmospheric Pressure

机译：大气压下自由燃烧氦弧焊缝形成的数值分析

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摘要

In order to clarify the formative mechanism of weld penetration in an arc welding process, a numerical model is useful to understand quantitative values of the balances of mass, energy and force in the welding phenomena. In the present paper, the whole region of welding process using a free-burning arc, namely, tungsten cathode, arc plasma and weld pool is treated in a unified numerical model to take into account the close interaction between the arc plasma and the liquid metal. Calculations are made for the time dependent development of the weld pool for the free-burning arc in helium at atmospheric pressure. It is shown that the calculated convective flow in the weld pool is dominated by the surface tension gradient force and the electromagnetic force. It is also shown that different surface tension properties can change the direction of re-circulatory flow in the weld pool and dramatically vary the weld penetration geometry.
机译：为了阐明电弧焊过程中焊缝熔深的形成机理，数值模型有助于理解焊接现象中质量，能量和力的平衡的定量值。在本文中，考虑到电弧等离子体与液态金属之间的紧密相互作用，在统一数值模型中处理了使用自由燃烧电弧的整个焊接过程区域，即钨阴极，电弧等离子体和焊池。 。计算大气压下氦气中自由燃烧电弧的熔池随时间的变化情况。结果表明，所计算的焊缝对流在表面张力梯度力和电磁力中占主导地位。还显示出不同的表面张力特性可以改变焊缝池中再循环流的方向，并显着改变焊缝熔深几何形状。

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