パルスアークにおける陽極への熱流束に及ぼす電流立ち上がり遷移時間の寄与
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概要
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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. In addition, the welding speed becomes slow, and the productivity is decreased. 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. Some researchers have elucidated that the pulse frequency of a current is to be 100 to 500Hz is effective for improvement of welding speed. In this frequency band, the arc and the heat transfer to anode become stable. 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.
著者
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湯本 雅恵
Department of Electrical and Electronic Enginnering, Tokyo City University
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籾井 平
Department of Electrical and Electronic Enginnering, Tokyo City University
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岩尾 徹
Department of Electrical and Electronic Enginnering, Tokyo City University