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GTAW 용접에 의한 STS 304 및 STS 316L의 이종용접 시 기계적 특성 평가
박재철(Jae-Cheul Park),한민수(Min-Su Han),장석기(Seok-Ki Jang),김성종(Seong-Jong Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This papers compared the mechanical characteristics and the weldability of GTAW by identical as well as dissimilar welding for STS 304 and STS 316L. It applied to double wall gas pipe of duel fuel engine for LNG carrier. The result of welded zone microstructure observation, a degree of acicular ferrite in STS 304 welded zone presented more than STS 316L. Beside, the variety ferrite phases were presented over the most of welded zone. As a result, it is concluded that the hardness of STS 304 welded zone presented higher than STS 316L welded zone by these effects.
이종 알루미늄 합금(6061-T6 : 5052-O)에 대한 마찰교반용접 시 이송속도 변수에 따른 기계적 특성
박재철(Jae-Cheul Park),손정호,김성종(Seong-Jong Kim) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
Recently, interest in using Al alloys in ship construction instead of fiber-reinforced plastic (FRP) has increased because of the advantages of Al alloy ships over FRP ships, including high speed, increased load capacity, and ease of recycling. This paper investigated the effects of traveling and rotating speed and welding location on optimum FSW conditions of dissimilar Al alloy such as 5052-O and 6061-T6 for ship.
해상구조물의 방식설계 최적화를 위한 설계요건 분석 및 시간의존적 방식성능 해석
박재철(Jae-Cheul Park),최유열(Yoo-Youl Choi),편강일(Kang-Il Pyeon),천강우(Kang-Woo Chun),장화섭(Hwa-Sup Jang),노길태(Gill-Tae Roh) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
The offshore structures exposed to harsh corrosive such as the marine environment is essential for the quality management technique throughout the life cycle of initial design, construction and operation. Also, it should satisfy the design life and ensure the safety of the substructure with optimization of design process. This study focused on optimization of design condition for corrosion protection of wind turbine structure and computational analyzing was performed to evaluate the performance of corrosion protection with utilizing practical experimental data. We expect this analytical study contribute to improve the corrosion maintenance stability and economical efficiency of designing wind turbine structures. As a result, the design of cathodic protection system using sacrificial anodes required accurate identification of current density in order to meet the long term design life, which can be seen that a change of structure surface’s coating breakdown factor is one of the key influencing factors.
ALBC3 합금의 수소과전압 현상을 이용한 캐비테이션과 전기화학적 특성
박재철(Jae-Cheul Park),이승준(Seung-Jun Lee),김성종(Seong-Jong Kim) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.6
In this study, the cavitation test and electrochemical experiments were conducted for ALBC3(Cu-Al) alloy that has an excellent corrosion resistance and cavitation characteristic in sea water. Based on the ASTMG32 regulation, the cavitation test was performed with the cavitation and cavitation erosion tester using piezoelectric effect. The electrochemical characteristics are evaluated with potentiostatic experiments in activation polarization potential range. As a result, cavitation damage is increased proportionally to temperature and time at 30 μm amplitude. It is appeared that acceleration period in weight loss presented over 6 hours under the cavitation environment in sea water. In addition, corrosion damages were observed at the potential range of -3.2~-1.4 V as the result of potensiostatic experiments during 12 hours in activation polarization potential range.
해양환경 하에서 동합금의 캐비테이션-부식손상 방지를 위한 방식정전류 기법 연구
박재철(Jae-Cheul Park),김성종(Seong-Jong Kim) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.1
The galvanostatic tests for corrosion protection are conducted at various applied current densities during 93,600 sec, and evaluated in terms of the variations in current density with time and in the potential at the applied current density. In addition, the corrosion damage depth is analyzed with 3D analysis optical microscope after galvanostatic tests. In this study, it was investigated to decide condition of the corrosion protection gavalnostatic method for Cu-Al alloy that has an excellent corrosion resistance. In the galvanostatic test under the cavitation environment, the energy was reflected or cancelled out by the collision with the oxygen gas generated by the oxygen reduction action. The surface observation showed neither the cavitation damage nor the electrochemical damage in the current density over 0.01 A/㎠ in the dynamic state under the cavitation environment.