Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effect of Heat Input on Girth Welds Properties of High Strain Steel Pipe

입열량이 고변형률 강관 원주 용접부 특성에 미치는 영향

  • Lee, Jin-Woo (Steel solution research group, Technical research laboratories, POSCO) ;
  • Song, Woo-Hyun (Steel solution research group, Technical research laboratories, POSCO) ;
  • Seo, Dong-Han (Steel solution research group, Technical research laboratories, POSCO) ;
  • Lee, Jong-Sub (Steel solution research group, Technical research laboratories, POSCO)
  • 이진우 (POSCO 기술연구원 강재솔루션 연구그룹) ;
  • 송우현 (POSCO 기술연구원 강재솔루션 연구그룹) ;
  • 서동한 (POSCO 기술연구원 강재솔루션 연구그룹) ;
  • 이종섭 (POSCO 기술연구원 강재솔루션 연구그룹)
  • Published : 2009.12.31
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Abstract

SBD (Strain-based design) of pipe lines have gained world-wide attention in recent years. The present research aims to evaluate the fracture characteristics of API (America Petroleum Institute) SBD X100 girth weldment that typically applied for cold climate and deep water offshore, with the focus on the influence of heat input changing with 6kJ/cm and 10kJ/cm from GMAW (Gas Metal Arc Welding). At a low heat input at 6kJ/cm, the weld metal had Multi-phase matrix (Acicular ferrite + Banite + Martensite) that could fill up both fracture toughness and strength as reported previously. Also, the weld metal exhibited 859MPa YS (Yield strength), 108J impact toughness at $-40^{\circ}C$ and 0.52mm CTOD (Crack Tip Open Displacement) at $-10^{\circ}C$. These results can be satisfied with the requirement of API SBD X100 girth weldment and Alaska pipe line project.

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References

  1. W. Kan, M. Weir, M. Zhang, D. Lilling : Strain-Based Pipelines-Design Consideration Overview, ISOPE proceeding, July, 2008, 174-181
  2. Wang, Y., Liu, M., and David R. : Strain Based Design of High Strength Pipelines, ISOPE Proceeding, July 2007, 3186-3192
  3. F. Minami, M. Ohata, and D.Watanabe : Fracture Assessment Procedure for Structural Components under Cyclic and Dynamic Loading, ISOPE Proceeding, July 2007, 3207-3215
  4. F. Minami, M. Ohata H. Shimanuki and Y. Hagihara : Method of constraint loss correction of CTOD fracture toughness for fracture assessment of steel components, Engineering Fracture Mechanics, June, 2006, 1996-2020 https://doi.org/10.1016/j.engfracmech.2006.03.013
  5. Shin, Y., Kang S., and Kim M.: Evaluation of Fracture Toughness and Microstructure on FCA Weldment According to Heat input, Journal of KWJS, 26-3 (2008), 51-60 (in Korean) https://doi.org/10.5781/KWJS.2008.26.3.051
  6. Y. Komizo and Y. Fukada: CTOD properties and MA Constituent in the HAZ of C-Mn Microalloyed Steel, The Sumitomo Search, 40 (1989) , 31-40
  7. M. G. Dawes : Fracture Control in High Yield Strength Weldments, Welding Research Supplement, 53 1974, 369-378
  8. J. Lee, J, Ju J. Jang and Dongil Kwon : Weld Crack assessments in API X65 Pipeline-failure assessment diagrams with variations in representative mechanical properties, Materials Science and Engineering A, 2004, 122-130 https://doi.org/10.1016/j.msea.2003.12.039