Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Patterns and Characteristics of Fatigue Failure in Cruciform Fillet Weld Joint

십자형 필릿 용접부에서의 피로파괴 형상과 특성

  • Lee, Yong-Bok (Department of Mechanical & system design Engineering, Hongik Univ.) ;
  • Chung, Joon-Ki (Department of Mechanical & system design Engineering, Hongik Univ.) ;
  • Park, Sang-Heup (Mechanical and Automative Engineering, Kongju National Univ.)
  • 이용복 (홍익대학교 기계.시스템디자인공학과) ;
  • 정준기 (홍익대학교 기계.시스템디자인공학과) ;
  • 박상흡 (공주대학교 기계자동차공학부)
  • Received : 2011.05.04
  • Accepted : 2011.08.16
  • Published : 2011.08.31
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Abstract

The proportion of the welding in the production process of machinery, buildings and marine structures is increasing and the joining are mainly conducted by butt and fillet weld. In the case of fillet weld, the shape of structures is complicated depending on the constraint on the geometry of the structures, therefore, the full penetration is mostly difficult. Accordingly, it is necessary to establish safe and economical criteria of design of the structures through the strength based on the penetration state of the fillet weld. Patterns of fatigue failure in cruciform fillet weld jont appear in the form of the root, toe and mixed failure. In the case of toe and mixed failure, the fatigue strength is higher than root failure. Therefore, we have to make the enough depth of penetration or perform the welding work through improving the fatigue strength of cruciform joints in welded structures. So it is necessary to optimize the penetrated depth in the range of the possible mixed failure and find the way in the cost-effective design to lessen the amount of the welding work.

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References

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