Nitrogen absorption phenomenon of GTA welding with nitrogen-mixed shielding gases: effect of plasma characteristics on nitrogen content in GTA welded metal

被引：1

作者：

Kodama, Shinji ^{[1
]}

Sugiura, Kazuki ^{[2
]}

Nakanishi, Shota ^{[2
]}

Tsujimura, Yoshihiro ^{[2
]}

Tanaka, Manabu ^{[2
]}

Murphy, Anthony B. ^{[3
]}

机构：

[1] Joining and Welding Research Institute, Osaka University

来源：

Welding International | 2015年 / 29卷 / 04期

关键词：

GTA welding; nitrogen content; numerical analysis; plasma heat source; shielding gas;

D O I：

10.1080/09507116.2014.921044

中图分类号：

学科分类号：

摘要：

In order to clarify the nitrogen absorption mechanism in gas tungsten arc welding, the measurement of the weld metal nitrogen content under nitrogen mixture shielding gases, and the numerical analysis of plasma heat source characteristics in nitrogen dissociation phenomenon were conducted. The nitrogen content of weld metal produced by He arc reduces to approximately a half relative to that by Ar arc in the shielding gas condition of less than about 1% mixture ratio. Additionally, it is assumed that a decline in the plasma temperature in the vicinity of the molten pools due to the generation of metal vapour, accompanied by a reduction in atom-like nitrogen content, cause intense impact on the reduction mechanism of weld metal nitrogen content in a He arc. © 2015, © 2014 Taylor & Francis.

引用

页码：262 / 269

页数：7

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