Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on the Fatigue Strength Improvement using Weld Toe Burr Grinding

용접토우부의 그라인딩에 의한 피로강도 증대효과에 대한 연구

  • Kang, Sung-Won (Dept. of Naval Architecture & Ocean Engineering, Pusan National University) ;
  • Kim, Myung-Hyun (Dept. of Naval Architecture & Ocean Engineering, Pusan National University) ;
  • Choi, Jae-Young (Dept. of Naval Architecture & Ocean Engineering, Pusan National University) ;
  • Kim, Wha-Soo (Hull Initial Design Department Shipbuilding Division, Hyundai Heavy Industies Co., Ltd.) ;
  • Paik, Young-Min (Hull Initial Design Department Shipbuilding Division, Hyundai Heavy Industies Co., Ltd.)
  • 강성원 (부산대학교 조선해양공학과) ;
  • 김명현 (부산대학교 조선해양공학과) ;
  • 최재영 (부산대학교 조선해양공학과) ;
  • 김화수 (현대중공업 조선구조설계부) ;
  • 백영민 (현대중공업 조선구조설계부)
  • Published : 2006.04.01
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Abstract

While it is known that the weld toe grinding method may give 3.4 times of fatigue strength improvement, this improvement may significantly vary according to weld bead shapes and loading modes. Although tremendous interest have been given in improving fatigue strength improvement for ship structures, quantitative results are yet in need. In this context, a series of fatigue tests is carried out for a type of test specimen that are typically found in ship structures. Weld burr grinding is carried out using a electric grinder in order to remove surface defects and improve the weld bead profile. The test results are compared with the same type of test specimen without applying the fatigue improvement technique in order to obtain a quantitative measure of the fatigue strength improvement. On the other hand, both hot spot stress and structural stress methods are employed to compare the effectiveness of the two methods in evaluating the fatigue strength improvement of welded structures.

Keywords

References

  1. A. Almar, 'FATIGUE HANDBOOK', TAPIR, 1985, 259-285
  2. Haagensen P. J., Maddox S. J., 'Specifications for weld toe improvement by burr grinding, tig dressing and hammer peening for transverse welds', IIW Commission XIII-Working Group 2, Collaborative Test Program on Improvement Techniques, 1995
  3. Lotsberg. I. ,'Overview of the FPSO-Fatigue Capacity JIP', Proceeding of the 18th international Conference on Offshore Mechanics and Arctic Engineering, MAE01/Mat-3010, Rio de janeiro Brazil, June 3-8, 2001
  4. S. W. Kang, M. H. Kim, J. H. An, W. S. Kim and Y. M. Paik, 'A study on the fatigue strength improvement using weld toe burr grinding'. Proceedings of KWS, 2005, 256-258 (in Korean)
  5. S. W. Kang. Y. W. Kim, W. S. Kim and D. H. Kim, 'Re-distribution of welding residual stress due to tensile pre-load and its effect on fatigue strength in padding plate waldment'. Journal of SNAK, 38-4 2001. 75-82 (in Korean)
  6. Dong. P.. Battelle Structural stress JIP Final Report, No. N004431-01, 2003
  7. Chitoshi MIKl, Kengo ANAMI, Hideki TANI and Ichiro SUGIMOTO. 'Fatigue strength improvement methods by Treating the weld toe'. Journal of JWS, 17-1. 1999, 111-119 (in Japanese)