1. 1) M. Kutsuna: Recent Laser Equipments and its Application, Welding Technology, 52-1 (2004), 74-81. (in Japanese)
2. 2) S. Tsukamoto: Laser Welding, Journal of the Japan Welding Society, 72-1 (2003), 16-21. (in Japanese)
3. 3) H. Minagawa: Recent Welding in Automotive Industry, Welding Technology, 52-2 (2004), 76-79. (in Japanese)
4. 4) K. Mori: Study of In-process monitoring for YAG laser welding Rep.2 Detection of welding quality, Quarterly Journal of the Japan Welding Society, 19-1 (2001), 182-187. (in Japanese)
5. 5) T. Ishide: Recent Application of Laser Processing in Heavy Industry, Welding Technology, 52-2 (2004), 62-68. (in Japanese)