著者

児玉 真二 椙浦 一輝 中西 省太 坂井 大介 辻村 吉寛 田中 学 MURPHY Anthony B.

出版者

一般社団法人 溶接学会

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.31, no.1, pp.80-87, 2013 (Released:2013-04-17)

参考文献数

11

被引用文献数

1 1

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The influences of welding condition on the atmospheric nitrogen mixing into the arc plasma in helium GTA welding was analyzed by numerical simulations. In order to evaluate the effects of the convection flow and the diffusion on the nitrogen mixing phenomenon, the distributions of the Peclet number was used. Elongation of the electrode length has low impact on the decrease of shielding gas concentration because the convection flow becomes dominant in this area which indicates higher Peclet numbers. Meanwhile, the nitrogen diffusion increases in the plasma area with the temperature of about 10,000K, so that elongation of the arc length leads to a remarkable decrease of shielding gas concentration. Additionally, the impact of convection flow increases in the arc center area where high-velocity plasma jet exists, and the shielding gas concentration tends to rise owing to higher welding current in the condition of sufficient shielding gas flow rate.