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Axial Force Behaviors of High-strength Bolt Treated by High Power CW Leaser

Qidi Wang 1, Shigenobu Kainuma 1, Shusen Zhuang 1, and Peng Huo 2
1. Department of Civil Engineering, Kyushu University, Fukuoka, Japan
2. CoolLaser Division, TOYOKOH Inc., Shizuoka, Japan

Manuscript received May 20, 2022; revised June 15, 2022; accepted July 14, 2022; issue published July 14, 2022.

Abstract— In this study, the axial force loss of high-strength bolt after 3kW CW-laser treatment was examined. High-strength bolt specimens were prepared, and a hand-held laser transmitter was irradiated on the bolt head with CW-laser power of 3kW. The change in the axial force on the bolts was examined during the bolt's treatment based on the irradiate duration on the bolt surface. Axial force loss of the bolts was affected by the irradiation duration and position. With multiple irradiations on the bolt head, the axial force loss reduced compared with the same irradiation time was confirmed. From the relationship between the axial force change and the treatment duration, axial force loss equations of bolt side laser treatment were suggested based on multiple round irradiations, which can help estimate the axial force loss and make the maintenance plan.

Index Terms—high strength bolt, Axial force loss, CW-Laser treatment, corrosion maintenance

Cite: Qidi Wang, Shigenobu Kainuma, Shusen Zhuang, and Peng Huo, "Axial Force Behaviors of High-strength Bolt Treated by High Power CW Leaser," International Journal of Structural and Civil Engineering Research, Vol. 11, No. 3, pp. 75-78, August 2022. doi: 10.18178/ijscer.11.3.75-78

Copyright © 2022 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.