한국레이저가공학회지 (Laser Solutions)

한국레이저가공학회 (Korean Society of Laser Processing)
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$CO_2$ 레이저 용접 이종재료강의 피로파괴거동에 관한 연구

A Study on Fatigue Fracture Behavior of Laser Beam Welding and Steel with Different Materials

  • 한문식 (계명대학교 기계.자동차공학부) ;
  • 서정 (한국기계연구원 정보장비연구센타) ;
  • 이제훈 (한국기계연구원 정보장비연구센타) ;
  • 김정오 (한국기계연구원 정보장비연구센타) ;
  • 전성민 (㈜평화산업 기술연구소)
  • Han, M.S. (Faculty of Mechanical and Automotive Engineering, Keimyung University) ;
  • Suh, J. (IT Machinery Technology Research Center, KIMM) ;
  • Lee, J.H. (IT Machinery Technology Research Center, KIMM) ;
  • Kim, J.O. (IT Machinery Technology Research Center, KIMM) ;
  • Jeon, S.M. (Institute of Technology, Pyung Hwa Industrial Co., LTD)
  • 발행 : 2006.09.30
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초록

In this paper, we investigated the characteristics of fatigue fracture on TB(Tailored Blank) weldment by comparing the fatigue crack propagation characteristics of base metal with those of TB welded sheet used for vehicle body panels. We also investigated the influence of center crack on the fatigue characteristic of laser weld sheet of same thickness. We conducted an experiment on fatigue crack propagation on the base metal specimen of 1.2mm thickness of cold-rolled metal sheet(SPCSD) and 2.0mm thickness of hot-rolled metal sheet(SAPH440) and 1.2+2.0mm TB specimen. We also made an experiment on fatigue crack propagation on 2.0+2.0mm and 1.2+1.2mm thickness TB specimen which had center crack. The characteristics of fatigue crack growth on the base metal were different from those on 1.2+2.0mm thickness TB specimen. The fatigue crack growth rate of the TB welded specimens is slower in low stress intensity factor range $({\Delta}K)$ region and faster in high${\Delta}K$ region than that of the base metal specimens. The slant crack angle slightly influenced the crack propagation of the TB specimen of 2.0+2.0mm thinkness.

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