アーク溶接における陽極への熱流束増大に及ぼす比熱の寄与

カテゴリ: 部門大会

論文No: 27

グループ名: 【B】平成25年電気学会電力・エネルギー部門大会

発行日: 2013/08/27

タイトル(英語): Contribution to Speci_x000C_c Heat for the Heat Flux Increment to Anode in Arc Welding

著者名: 木村 昌博(東京都市大学),山本 真司(東京都市大学),岩尾 徹(東京都市大学),湯本 _x0003_雅恵(東京都市大学)

著者名(英語): masahiro Kimura(Tokyo City University),Shinji Yamamoto(Tokyo City University),Toru Iwao(Tokyo City University),motoshige Yumoto(Tokyo City University)

キーワード: GTA溶接|熱流束|酸素|比熱|電磁熱流体シミュレーション|GTA welding|heat flux|oxygen|specific heat|electromagnetic thermal fluid simulation

要約(日本語): In the arc welding, GTA (Gas Tungsten Arc) welding is high quality and much applicable material. However, the welding defect sometimes occurs. It is important to control the heat transfer to anode at various current, interelectrode distance and shielding gas. The heat flux and current density increases in the case of mixing the oxygen because of the arc constriction affected by the specific heat of the thermal properties. However, the specific heat of dissociative gas has the two peaks with dissociation and ionization. Thus, it is necessary to discuss for every temperature region of arc. The contribution to specific heat for the heat flux increment to anode in arc welding was elucidated. The imaginary gas is used because the ionization and dissociation reaction is focused on. As a result, the specific heat increment with dissociation became the constriction at the periphery part of arc. When the electron density concentrates on the central part and the current path was narrow, the arc temperature and electron density increased. However the constriction of thermal conductivity increment at the central part was not affected by the specific heat increment with ionization. The current density and heat flux didn’t increase. Therefore, the heat flux increment to anode in arc welding is elucidated was contributed by specific heat.

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