交流プラズマトーチ用タングステン電極の電極サイズ設計手法の検討

DOI Web Site Web Site 参考文献19件

書誌事項

タイトル別名
  • Design Consideration of Tungsten Electrode Size in AC Plasma Torch
  • コウリュウ プラズマ トーチヨウ タングステン デンキョク ノ デンキョク サ

この論文をさがす

抄録

Heavy erosion of the electrode is one of serious problems in using AC plasma torches. In a series of our studies, a good correlation was obtained between the calculated temperature of electrode tip and the measured electrode erosion. In this paper, the experimental investigation on the electrode sheath drop voltage, one of the most influential factor on the electrode erosion, was carried out and on the basis of the result the investigation on a method of designing electrode size was carried out. The electrode used was of solid type and the material was tungsten containing 2wt% of lanthanum oxide. The plasma gas was argon. Main results are as follows:<br>(1) The electrode sheath drop voltage Vdrop was calculated on the basis of heat balance in the electrode. As the current increased, the calculated temperature of the electrode tip Tt increased and Vdrop decreased to 2-3V gradually. These results suggested that the higher temperature of the electrode caused the electron to be apt to be emitted from the electrode, and the necessary power for the electron emission and Vdrop dec reased.<br>(2) The investigation on a method of designing the optimum electrode size was carried out for the desired electrode erosion Ew and arc current, making use of the relation Ew-Tt, the relation Vdrop- Tt and the calculation of heat balance of the electrode. Using the method, the optimum electrode size was designed for 2, 000A, for example, the length 6mm and the diameter 16mm were obtained.

収録刊行物

参考文献 (19)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ