ヘリウムガスタングステンアーク溶接にけるシールドガスへの窒素混入現象に及ぼすプラズマ特性の影響

• 児玉 真二

  Nippon Steel & Sumitomo Metal Corporation

• 椙浦 一輝

  Joining and Welding Research Institute, Osaka University

• 中西 省太

  Joining and Welding Research Institute, Osaka University

• 坂井 大介

  Joining and Welding Research Institute, Osaka University

• 辻村 吉寛

  Joining and Welding Research Institute, Osaka University

• 田中 学

  Joining and Welding Research Institute, Osaka University

• MURPHY Anthony B.

  CSIRO Materials Science and Engineering

書誌事項

タイトル別名

• Influence of Plasma Characteristics on Nitrogen Mixing into Shielding Gas in Helium Gas Tungsten Arc Welding

抄録

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.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 31 (1), 80-87, 2013

  一般社団法人 溶接学会

キーワード

• GTA Welding
• Arc plasma
• Shield Gas
• Atmospheric nitrogen
• Welding condition
• Numerical analysis

詳細情報

• CRID: 1390001204724609280
• NII論文ID: 130004889458
• DOI: 10.2207/qjjws.31.80
• COI: 1:CAS:528:DC%2BC3sXns1Oksr4%3D
• ISSN: 24348252
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可