1. 1) N. Nagashima and T. Yamazaki: Welding Technology, Vol.48, No.4 (2000), p.71-75. (in Japanese)
2. 2) K. Suita, S. Suzuki, Y. Sakamoto and Y. Shibata: Current Status of a Spot-welding Gun for Automobile Body Assembly Lines Incorporating a State of the Art Integrated Servo-motor, Journal of Society of Automotive Engineers of Japan, Vol.50, No.12 (1996), p.57-63. (in Japanese)
3. 3) T. Okuda, Welding Technology, Vol.21, No.12 (1973), p.92-97. (in Japanese)
4. 5) K. Beshiyo, T. Matsuoka, S. Hasebe, Y. Hobo and T. Kawai: Spot Weldability of High Strength Steel Sheet, Sumitomo metals, Vol.26, No.2 (1974), p.182-192. (in Japanese)