Numerical Analysis for Weld Formation Using a Free-Burning Helium Arc at Atmospheric Pressure
Numerical Analysis for Weld Formation Using a Free-Burning Helium Arc at Atmospheric Pressure
复制标题
在大气压下使用自由燃烧氦气电弧进行焊缝形成的数值分析
DOI：
10.1299/jsmeb.48.397
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. Lowke
中科院分区：
文献类型：
--
作者：
Manabu Tanaka;M. Ushio;J. Lowke
为了阐明弧焊过程中熔透的形成机理，数值模型有助于理解焊接现象中质量、能量和力平衡的定量值。考虑到电弧等离子体与液态金属的密切相互作用，本文对自由燃烧电弧焊接过程的整个区域，即钨阴极、电弧等离子体和焊池进行了统一的数值模型处理。计算了常压下氦中自由燃烧电弧熔池的随时间发展。结果表明，计算得到的熔池对流流主要受表面张力梯度力和电磁力的支配。研究还表明，不同的表面张力能改变熔池中再循环流动的方向，并显著改变焊缝的贯通几何形状。
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.