1. 1) H.Saitou, H.Nomura, T.Yosinaga, T.Mita: Development of New Plasma Welding Machine, Report of Technical Commission on Welding Process of JWS, SW-2390-95 (1995), 1-5 (in Japanese)
2. 2) I.Koizumi, N.Yamauchi, T.kou: Study of TIG Welding Method (1st Report), Preprints of the National Meeting of the Japan Welding Society, 20 (1977), 156-157 (in Japanese)
3. 3) H.Fujii, Y.Sumi, M.Tanaka, M.kamai, K.Nogi: Effect of Welding Current, Arc Length and Shielding Gas Flow Rate, Preprints of the National Meeting of the Japan Welding Society, 70 (2002), 310-311 (in Japanese)
4. 4) K.Hiraoka, A.Okada, M.Inagaki: Effect of Electrode Geometry on Maximum Arc Pressure in Gas Tungsten Arc Welding, Quarterly Journal of the Japan Welding Society, Vol.3, No2 (1985), 249-251 (in Japanese)