パルスアークにおける陽極への入熱量と熱流束に及ぼす電流立ち上がり遷移時間の寄与

カテゴリ: 部門大会

論文No: 41

グループ名: 【B】平成24年電気学会電力・エネルギー部門大会

発行日: 2012/09/12

タイトル(英語): Contribution for Heat Transfer and Heat Flux to Anode Affected by Rise Current Transition Time in Pulse Arc

著者名: 籾井 平(東京都市大学),岩尾 徹(東京都市大学),湯本 雅恵(東京都市大学)

著者名(英語): Taira Momii(Tokyo City University),Toru Iwao(Tokyo City University),Motoshige Yumoto(Tokyo City University)

キーワード: パルスアーク|アーク溶接|入熱量|電界|電磁流体シミュレーション大電流|pulsed arc|arc welding|heat transfer|electrical field|MHD simulationhigh current

要約(日本語): Gas tungsten arc (GTA) welding is a high-quality joining technology.
However, the TIG welding cannot melt the welding pool deeply.
Therefore, the weld defect sometimes occurs at TIG welding because of this poor heat transfer to the anode and ability of melting deeply.
The welding parameter should be controlled in order to improve the welding productivity and prevent the weld defect.
The pulsed arc welding has been developed because it can control the heat transfer with the current waveform.
Therefore, the material can be melted easily because the heat transfer is concentrated.
However, the shape of welding pool is decided by the temperature distribution near cathode, the current density distribution at the arc and welding pool and driving force in the welding pool.
Especially, the Lorentz force (current density times magnetic flux density) is very important factor in order to become deep welding pool.
In the case of pulsed arc welding, these phenomena are derived from current waveform, especially the current peak, base, and transition time.
In this paper, contribution for the heat transfer and heat flux to anode affected by rise current transition time in pulsed arc is elucidated.
As a result, when the current transition time decreases, the heat transfer becomes small, and the heat flux is concentrated to the center.
Therefore, the current transition time plays important role for making welding pool.

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