Numerical Analysis of Heat Source Characteristics of a Constricted TIG Arc for Welding of Aluminium
Numerical Analysis of Heat Source Characteristics of a Constricted TIG Arc for Welding of Aluminium
复制标题
铝焊接收缩TIG电弧热源特性的数值分析
DOI：
10.11283/jlwa.55.227
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Anthony B. Murphy
中科院分区：
文献类型：
--
作者：
小西恭平;茂田正哉;田中学;村田彰久;村田唯介;Anthony B. Murphy
收缩喷嘴TIG焊是一种高水平的焊接新工艺。在该工艺中，在钨电极和普通气体喷嘴之间附加一个被称为“收缩喷嘴”的气体喷嘴。该工艺实现了非常薄的金属板的焊接，而这对于传统的TIG焊接工艺是困难的。在这项研究中，数值模拟的重点是传统的TIG焊接和TIG焊接与收缩喷嘴进行，以了解电弧现象，澄清收缩喷嘴的效果。电流密度集中在电弧等离子体的中心部分，这是因为沿电极沿着流动的高速气体冷却了电弧等离子体的边缘。结果表明，在采用收缩喷嘴的TIG焊中，等离子体射流的速度大大提高，电弧等离子体的温度提高了2000 K以上。这些特性使得电弧等离子体稳定和高能量密度，并有助于相当薄的金属板的焊接。
Tungsten Inert Gas (TIG) welding with a constricted nozzle is one of new higher-level welding processes. In this process, an additional gas nozzle which is called``constricted nozzle''is attached between a tungsten electrode and a normal gas nozzle. This process achieves a welding of quite thin sheet metal whereas it is di‹ cult for the conventional TIG welding process. In this study, numerical simulations with a focus on the conventional TIG welding and the TIG welding with a constricted nozzle were performed in order to understand the arc phenomena and clarify the effect of the constricted nozzle. The current density was concentrated to the center part of the arc plasma because the high speed gas which flows along the electrode cools the edge of arc plasma. As a result, the velocity of the plasma jet was greatly increased and the temperature of the arc plasma increased more than 2000 K in the TIG welding with a constricted nozzle. These characteristics make the arc plasma stable and high energy density and contribute to the welding of quite thin sheet metal.