Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Evaluation on Mechanical Properties with Welding Processes for Off Shore Wind Tower Application

TMCP강을 적용한 해상용 풍력타워의 용접 공정에 따른 기계적 물성 평가

  • Ji, Changwook (School of Materials Science and Engineering, Pusan National University) ;
  • Choi, Chul Young (School of Materials Science and Engineering, Pusan National University) ;
  • Nam, Dae-Geun (Dongnam Regional Division, Korea Institute of Industrial Technology) ;
  • Kim, Hyoung Chan (Dongnam Regional Division, Korea Institute of Industrial Technology) ;
  • Jang, Jae Ho (Dongnam Regional Division, Korea Institute of Industrial Technology) ;
  • Kim, Ki Hyuk (Plate Research Team and R&D Center, Dongkuk Steel) ;
  • Park, Yeong-Do (Department of Advanced Materials Engineering, Dong-Eui University)
  • 지창욱 (부산대학교 재료공학과) ;
  • 최철영 (부산대학교 재료공학과) ;
  • 남대근 (한국생산기술연구원 동남권지역본부) ;
  • 김형찬 (한국생산기술연구원 동남권지역본부) ;
  • 장재호 (한국생산기술연구원 동남권지역본부) ;
  • 김기혁 (동국제강 중앙기술연구소 후판 연구팀) ;
  • 박영도 (동의대학교 신소재공학과)
  • Received : 2014.02.03
  • Accepted : 2014.02.24
  • Published : 2014.02.28
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Abstract

FCAW(Flux Cored Arc Welding), SAW(Submerged Arc Welding), EGW(Electro Gas Welding), and three-pole SAW are applicable in manufacturing the offshore wind tower. In this paper, mechanical properties of these welded-joints for TMCP steels were evaluated in all above welding processes. The tensile strength of welded-joints for all the welding methods satisfied the standard guideline (KS D 3515). No cracking on weldment was found after the bending test. Changes of weldedments hardness with welding processes were observed. In a weld HAZ (heat-affected zone), a softened HAZ-zone was formed with high heat input welding processes (SAW and EGW). However, the welded-joint fractures were found in the base metal for all cases and small decrease in welded-joint strength was caused by a softened zone. The multi-pole SAW welds exhibited similar mechanical properties comparing to the one with one-pole SAW process.

Keywords

References

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