1. 1) M. Kimura, H. Mioh, M. Kusaka, K. Seo and A. Fuji: Observation of the Joining Phenomena in 1st Phase of Friction Welding, in contributing.
2. 4) Japan Society of Mechanical Engineers: JSME Mechanical Engineers’ Handbook A6: Thermal Engineering, Maruzen (1993), A6-181. (in Japanese)
3. 5) Japan Friction Welding Association: Friction Welding, Corona Publishing (1979), 32. (in Japanese)