Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Effect of Welding method and Welding Material to Corrosion Property of Repair Weld Zone for Exhaust Valve in 5% H2SO4 Solution -1

5% 황산용액에서 배기밸브 보수 용접부의 부식 특성에 미치는 용접방법과 용접봉의 영향-1

  • 김진경 (한국해양수산연수원 교육연구처) ;
  • 조황래 (한국해양대학교 공과대학 기계소재공학부) ;
  • 이명훈 (한국해양대학교 해사대학 기관시스템공학부) ;
  • 김윤해 (한국해양대학교 공과대학 기계소재공학부) ;
  • 문경만 (한국해양대학교 기계소재공학부)
  • Published : 2007.09.30
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Abstract

Recently a fuel oil of the diesel engine in the ship is being changed with low quality as the oil price is higher more and more. Therefore the wear and corrosion in all parts of the engine like cylinder liner ring groove of piston crown, spindle and seat ring of exhaust valve are increased with using of heavy oil of low quality In particular the degree of wear and corrosion in between valve spindle and seat ring are more serious compared to the other parts of the engine due to operating in severe environment such as the high temperature of exhaust gas and repeating impact. Thus the repair weld to the valve spindle and seat ring is a unique method to prolong the life of the exhaust valve in an economical point of view In this study. corrosion property of both weld metal zone and base metal was investigated with some electrochemical methods such as measurement of corrosion potential, cathodic and anodic polarization curves, cyclic voltammogram and polarization resistance etc. in 5% $H_2SO_4$ solution. in the case of being welded with some welding methods and welding materials to the exhaust valve specimen as the base metal. In all cases. the values of hardness of the weld metal zone were more high than that of the base metal. And their corrosion resistance were also superior to the base metal. The weld metal of A2F(AC SMAW: 2 pass welding with foreign electrode) showed a relatively good results to the corrosion resistance as well as the hardness compared to the ether welding methods and welding materials. Moreover it indicated that hardness of the weld metal by the domestic electrode was considerably high compared to that of the foreign electrode.

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References

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