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JWJ > Volume 24(2); 2006 > Article
Journal of KWJS 2006 April;24(2) :42-47.
Published online July 18, 2006.
A Study on the Fatigue Strength Improvement using Weld Toe Burr Grinding
Sung-Won Kang, Myung-Hyun Kim, Jae-Young Choi, Wha-Soo Kim, Young-Min Paik




Correspondence:   Published online July 18, 2006
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: Toe grinding;Fatigue strength;Fatigue test;Burr grinding;Hot spot stress;Structural stress
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