Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Evaluation of Corrosion Characteristics on Welding Zone of Leakage SeawaterPipe Welded by Underwater Welding Electrode

수중 용접봉으로 용접한 누수배관 용접부위의 부식 특성 평가

  • 문경만 (한국해양대학교 공과대학 기계소재공학부) ;
  • 이성열 (한국해양대학교 공과대학 기계소재공학부) ;
  • 김윤해 (한국해양대학교 공과대학 기계소재공학부) ;
  • 이명훈 (한국해양대학교 해사대학 기관시스템공학부) ;
  • 김진경 (한국해양수산연수원 교육연구처)
  • Published : 2008.11.30
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Abstract

Leakage trouble on the sea water pipeline in engine room is often resulted from a localized corrosion due to severe corrosive environment caused by both high speed and high pressure of sea water flowing through the inner pipe. In addition, when the ship is in stand-by or emergency condition, underwater welding to control the leakage of sea water from a hole of its pipe is very important in an industrial safety point of view. In this study possibility of underwater welding to control leakage of sea water and corrosion property of its welding zone were investigated with the electrochemical methods by parameters of welding methods and welding electrodes when underwater welding is achieved with a such case that sea water is being leaked out with a height at 50mm from a hole of $2.5mm{\emptyset}$ of test pipe. Corrosion resistance of weld metal zone is better than the base metal and its hardness is higher than that of the base metal. However corrosion potential of weld metal zone showed a negative value than that of the base metal, therefore weld metal zone is preferentially corroded rather than the base metal by performance of galvanic cell due to difference of corrosion potential between weld metal zone and base metal. Eventually it is suggested that leakage of sea water is successfully controlled by underwater welding,

Keywords

References

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