1. 1) S. Tsukamoto: Laser Welding, Journal of the Japan Welding Society, 72 (2003), 16-21. (in Japanese)
2. 2) Y. Nakanishi: Development of Welding Process and Structural Technology, Journal of the Japan Welding Society, 72 (2003), 5-11. (in Japanese)
3. 3) H. Yamaoka, M. Yuki, K. Tsuchiya, R. Ikeda, Y. Kitani, K. Yasuda: Properties and fracture toughness evaluation of SM490 laser welds, Preprints of the National Meeting of J.W.S., 67 (2000), 242-243. (in Japanese)
4. 4) R. Ikeda, Y. Kitani, K. Yasuda, H. Yamaoka, M. Yuki, K. Tsuchiya: Effect of chemical composition on toughness of laser beam welds in steel plates, Preprints of the National Meeting of J.W.S., 67 (2000), 244-245. (in Japanese)
5. 5) Y. Okita, N. Kurosawa, R. Ikeda, K. Yasuda: Refining of Microstructure in Laser Weld Metal by Oxygen Addition from Shielding Gas, Preprints of the National Meeting of J.W.S., 69 (2001), 50-51. (in Japanese)