1. 1) S.Torizuka, K.Nagai and A.Sato : J. Jpn. Soc. Technol. Plast., 42 (2001), 287.
2. 2) Y.Hagiwara, M.Niikura, M.Shimotomai, Y.Abe and Y.Shirota : J. Jpn. Soc. Technol. Plast., 42 (2001), 36.
3. 3) S.Tsukamoto, I.Kawaguchi, T.Otani, G.Arakane and H.Honda : Proc. 6th Int. Conf. on Trends in Welding Research, ASM International, (2002), 459.
4. 4) H.Yamaoka, M.Yuuki, K.Tsuchiya, R.Ikeda, Y.Kitani and K.Yasuda : Preprints of Nat. Meeting of Jpn. Weld. Soc., 67 (2000), 242.
5. 5) T.Otani, S.Tsukamoto, G.Arakane, Y.Kawaguchi and A.Ohmori : Q. J. Jpn. Weld. Soc., 21 (2003), 425.