• Title/Summary/Keyword: 용접봉

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Optimization of Friction Welding of Cr-Mo Steels and Real-Time Nondestructive Evaluation by Acoustic Emission Method (Cr-Mo강의 마찰용접 최적화와 음향방출법에 의한 실시간 비파괴적 평가)

  • Oh, S.K.;Jang, J.H.;Chang, H.K.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.15 no.4
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    • pp.511-519
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    • 1996

  • The purposes of this study are 1) to develop optimum FRW technique of SNCM220, SCM435, SACM645 and SCM415 bar-to-bar similar friction welding, 2) to develop in-process real-time weld quality nondestructive evaluation technique by acoustic emission method, and 3) to certify of weld quality by inspection of tensile fracture surface on friction welded joints.

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Evaluation of the corrosion property on the welded zone of seawater pipe by A.C shielded metal arc welding (교류 피복아크 용접에 의한 해수 배관 용접부위의 부식 특성 평가)

  • Jeong, Jae-Hyun;Kim, Yun-Hae;Moon, Kyung-Man;Lee, Myeong-Hoon;Kim, Jin-Gyeong
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.8
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    • pp.877-885
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    • 2013

  • A seawater pipe of the engine room in the ships is being surrounded with severely corrosive environments caused by fast flowing of the seawater, containing aggressive chloride ion and high conductivity etc.. Therefore, the leakage of the seawater from its pipe have been often occurred due to its local corrosion by aggressive chloride ions. Subsequently, its leakage area is usually welded by AC shielded metal arc welding with various electrodes. In this study, when the sea water pipe is welded with several types of electrodes such as E4301, E4311, E4313 and E4316, a difference of the corrosion resistance on the welding metal zones was investigated using an electrochemical method, observing microstructure, measuring polarization behaviors and hardness. The weld metal zone welded with E4313 electrode exhibited the lowest value of hardness compared to other weld metal zones. In addition, its zone indicated also the best corrosion resistance than those of other weld metal zones. Furthermore, all of the weld metal zones revealed a relatively better corrosion resistance than those of the base metal zones. and also showed higher hardness than the base metal zones.

  • https://doi.org/10.5916/jkosme.2013.37.8.877 인용 PDF KSCI