Numerical simulation of keyhole welding of aluminium thick plate with plasma arc
Numerical simulation of keyhole welding of aluminium thick plate with plasma arc
复制标题
等离子弧铝厚板小孔焊接数值模拟
DOI：
10.1080/09507116.2011.590672
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Era
中科院分区：
文献类型：
--
作者：
S. Tashiro;Manabu Tanaka;T. Ueyama;T. Era
等离子弧焊可以实现高速焊接、焊缝熔深更深、热变形更小。由于这些原因，小孔焊接采用等离子弧焊。然而，有人指出，获得焊接的稳定性是很困难的。在本研究中，我们开发了一个统一的等离子弧焊接模型，用于分析焊接机理以及焊枪设计和电弧操作条件对焊接过程的影响。本文对采用等离子弧的厚铝板小孔焊接进行了数值分析，以阐明决定小孔尺寸的机制，这对于提高工艺的稳定性至关重要。结果发现，小孔尺寸主要由熔池表面张力与金属蒸气压之间的力平衡决定。
Plasma arc welding can realize high-speed welding, deeper weld penetration and, furthermore, smaller thermal distortion. For these reasons, plasma arc welding is employed for keyhole welding. However, it has been pointed out that it is difficult to obtain the stability of the welding. In this study, we have developed a unified plasma arc welding model for analysing the welding mechanism and influence of the torch design and operation conditions of the arc on the welding process. In this paper, the keyhole welding of a thick aluminium plate employing the plasma arc was numerically analyzed for clarifying the mechanism determining the keyhole size which is important for improving the stability of the process. As a result, it was found that the keyhole size is determined mainly by a force balance between the surface tension of a weld pool and metal vapour pressure.