Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Evaluation of Fracture Toughness and Microstructure on FCA Weldment According to Heat Input

입열량에 따른 FCAW용접부 파괴인성에 미치는 미세조직의 영향

  • Shin, Yong-Taek (Department of Welding Research, Samsung Heavy Industries Co., Ltd.) ;
  • Kang, Sung-Won (Naval Architecture & Ocean Engineering, Pusan National University) ;
  • Kim, Myung-Hyun (Naval Architecture & Ocean Engineering, Pusan National University)
  • 신용택 (삼성중공업 산업기술연구소) ;
  • 강성원 (부산대학교 조선해양공학과) ;
  • 김명현 (부산대학교 조선해양공학과)
  • Published : 2008.06.30
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Abstract

This paper is to evaluate fracture characteristics of API 2W Gr.50 TMCP steel weldment typically applied for offshore structures, with the focus on the influence of heat input arising from flux cored arc welding. Based on the results and insights developed from this study, it is found that the toughness for both CTOD and impact exhibits a tendency to decrease as the weld heat input increases. The reheated zone of weldmetal exhibit lower hardness than solidified zone and microstructure that are liable to affect the toughness are acicular ferrite and martensite-austenite constituents (M-A). In particular, M-A is a more effective micro-phase for CTOD toughness than impact toughness.

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References

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