气体保护金属极电弧焊
熔池
焊接
等离子弧焊接
等离子体
弧(几何)
材料科学
阳极
电弧吹扫
钨极气体保护焊
冶金
阴极
锁孔
复合材料
热影响区
电极
电弧焊
机械
化学
机械工程
物理化学
工程类
物理
量子力学
作者
Dongsheng Wu,Shinichi Tashiro,ZIANG WU,Manabu Tanaka,Kazufumi Nomura,Xueming Hua
出处
期刊:Welding Journal
[American Welding Society]
日期:2020-05-01
卷期号:99 (05): 146s-155s
被引量:4
摘要
A hybrid welding technique formed by combining keyhole plasma arc welding (KPAW) and pulsed gas metal arc welding (GMAW-P) is characterized by the complex interactions of the arc, droplet, keyhole, and weld pool. With the help of a high-speed video camera, zirconia particles, and a thermal camera, the complex interactive phenomena of the hybrid KPAW–GMAW-P process was analyzed. Owing to the formation of a direct-current path between the KPAW cathode (tungsten electrode) and the GMAW anode (welding wire), the ionized plasma arc was extended to the GMA side, causing an expansion of the GMA. The current at the GMAW droplet was diverged; thus, the Lorentz force promoted a more stable one pulse one droplet metal transfer mode compared with that of GMAW-P. The strong backward flow from the keyhole was suppressed because of the pull-push flow pattern on the top surface of the weld pool be-tween the two arcs. As the heat and molten metal in the weld pool were transported from the region near the GMA (high temperature) to the region near the plasma arc (low temperature), the weld pool temperature decreased.
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