1. Hasegawa, N., Hamatani, H., Fukami, T., Nakaji, T., Takeda, Y., Motoyoshi, T., Tanimoto, M., Ohsawa, T., “Development of a New Optical Monitoring System for HF-ERW Welding Processes”, Nippon Steel & Sumitomo Metal Technical Report, No. 107, pp. 114-120, 2015.
2. Kim, C. M., 2009, Defect Occurrence Mechanism and Fatigue Crack Propagation Behavior in High Frequency Electric Resistance Welded Joint, A Thesis for a Doctorate, Hanyang University, Republic of Korea.
3. Haga, H., Aoki, K., Sato, T., “Welding Phenomena and Welding Mechanisms in High-frequency Electric Resistance Welding-1st report”, Welding Journal, Vol. 59, No. 7, pp. 208s-212s, 1980.
4. Choi, J. H., Chang, Y. S., Kim, C. M., Oh, J. S., and Kim, Y. S., “Penetrator Formation Mechanisms during High-frequency Electric Resistance Welding”, Welding Journal, Vol. 83, No. 1, pp. 27s-31s, 2004.
5. P. Simion, V. Dia, B. Istrate, G. Hrituleac, I. Hrituleac, and C. Munteanu, "Study of Fatigue Behavior of Longitudinal Welded Pipes", IOP Conf. Series: Materials Science and Engineering Vol. 145, 2016.