Fatigue Resistance Improvement of Welded Joints by Bristle Roll-Brush Grinding
- 58 Downloads
In the periodic repainting of steel bridges, often the steel surface has to be prepared by using power tools to remove surface contaminants, such as deteriorated paint film and rust, and to increase the adhesive strengths of the paint films to be applied newly. Surface preparation by bristle roll-brush grinding, which is a type of power tool, may additionally introduce compressive residual stress and increase the fatigue resistance of welded joints owing to the impact of rotating bristle tips. In this study, fatigue tests were conducted for longitudinally out-of-plane gusset fillet welded joints and transversely butt-welded joints to evaluate the effect of bristle roll-brush grinding prior to repainting on the fatigue resistance of the welded joints. The test results showed that bristle roll-brush grinding introduced compressive residual stress and significantly increased fatigue limits by over 50%.
KeywordsFatigue Steel structure Out-of-plane gusset welded joint Butt-welded joint Surface preparation Roll-brush grinding Fatigue resistance improvement
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP; No. NRF-2017R1A2A2A05069679).
- Bristle Blaster Brochure. http://www.mbxit.com/files/data_sheets/Bristel_Blaster_Brochure.pdf.
- Hobbacher, A. (2009). IIW recommendations for fatigue design of welded joints and components. New York: Welding Research Council.Google Scholar
- Huther, I., Suchier, Y., & Lieurade, H. P. (2006). “Fatigue behaviour of longitudinal non-load carrying joints improved by burr grinding, TIG dressing.” International Institute of Welding IIW-doc XIII-2108-06.Google Scholar
- Japan Society of Steel Construction. (1993). Fatigue design recommendations for steel structures. Gihodo Shuppan (in Japanese).Google Scholar
- Kakiichi, T., Ishikawa, T., & Yamada, K. (2011). Stress measurement and fatigue durability evaluation of plate girder web detail at cross beam. Kozo Kogaku Ronbunshu A, 57A, 852–859. (in Japanese).Google Scholar
- KS D 3515. (2008). Rolled steels for welded structures. Korean Standards (in Korean).Google Scholar
- Lee, C. Y. (2010). Present condition of steel bridge coating in Korean highway. Korean Society of Steel Construction, 22(5), 9–12. (in Korean).Google Scholar
- Mori, T., & Toshiya, I. (2004). “Influence of grinding method on fatigue strength of out-of-plane gusset welded joints.” International Institute of Welding IIW-doc XIII-1970-03.Google Scholar
- Mori, T., Toshiya, I., & Hirayama, S. (2004). Influence of grinding method on fatigue strength of out-of-plane gusset welded joints. Kou kouzou rombunshuu, 11(42), 55–62. (in Japanese).Google Scholar