Numerical analysis of arc plasma and weld pool formation by a tandem TIG arc
Numerical analysis of arc plasma and weld pool formation by a tandem TIG arc
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DOI：
10.1007/s40194-013-0040-8
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发表时间：
2013-03
影响因子：
2.1
通讯作者：
Y. Ogino;Y. Hirata;J. Kawata;K. Nomura
中科院分区：
文献类型：
--
作者：
Y. Ogino;Y. Hirata;J. Kawata;K. Nomura
多电极焊接工艺用于各种工业领域以提高生产率。这些工艺可以使用焊接方法、电流值和极性以及电极对准的许多组合。然而，这使焊接现象复杂化。在这项研究中，我们集中在串联钨极惰性气体（TIG）电弧，这是一个相对简单的多电极焊接工艺。我们进行了数值研究，以澄清所涉及的现象，串列TIG电弧等离子体和焊接熔池的形成。串联TIG焊的焊点外观呈椭球形，比单电极TIG焊的焊点深。在串联TIG焊缝中的等离子体流的剪切应力的减小导致更深的熔深。此外，计算电极对准的影响，并且确定焊点外观显著改变。这种现象与电弧等离子体的形状密切相关。数值计算结果与实验结果吻合较好，证明了该模型具有较高的可靠性。
Multi-electrode welding processes are used in various industrial fields for higher productivity. These processes can use many combinations of welding methods, current values and polarities, and electrode alignments. However, this complicates welding phenomena. In this research, we focused on the tandem tungsten inert gas (TIG) arc, which is a relatively simple multi-electrode welding process. We performed a numerical investigation into the tandem TIG arc plasma and weld pool formation to clarify the phenomena involved. The weld spot of a tandem TIG weld is ellipsoidal in appearance and is deeper than that of a single-electrode TIG weld. Reduction in the shear stress of the plasma flow in the tandem TIG weld leads to a deeper penetration. Furthermore, the influence of the electrode alignment is calculated, and it is determined that the weld spot appearance significantly changes. The appearance is strongly related to the arc plasma shape. These numerical results show good agreement with the experimental results, which proves that our model has relatively high reliability.