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레이저 용접 공정 시 발생하는 잔류 응력에 저감 방법에 대한 연구
이우람(W. R. Lee),이철구(C. K. Lee) 한국도시철도학회 2014 한국도시철도학회논문집 Vol.2 No.4
The demand for the increase of the welding quality such as optimized welding process control, The study on the prediction and evaluation of residual stress among the research to improve the quality of laser welding process and increasing the mechanical property are not yet satisfied compared with their importance. The simulated results could be applied to estimate a peening effect, when a different confinement was used in the laser shock peening process. The residual stress could be formed by the depth of the proposed method of reducing the residual stress is performed in the optimal condition. The welded structures and products during the production process increase the mechanical property of repeated stress, which could be expected to extend the fatigue life of the structure.
자기장 영향에 따른 냉연압연 강판의 파이버 레이저 마이크로 접합 공정
이철구(C.K. Lee),이우람(W.R. Lee) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.3
We have studied on welding dissimilar materials of Carbon steel SCP1-S by using laser beam. In this research we have performed some experiments to know the possibility of welding dissimilar materials using laser beam and magnetic fields by adjusting the power output of 35W laser. Other conditions of the experiments were as follows : the welding speed was varied in the range 10 m/min nitrogen gas was used as shield gas, the flow value of shield gas was ranged 10 L/min. In order to ascertain of the welded surface, we have done the tensile strength testing, the hardness testing and the microscope observation. As a result, we have found that tensile strength was the highest at the condition of the welding speed of 10mm/s, the flow value of 10 L/min, the gap of two materials 0, and the use of nitrogen gas. Above testings have also showed that the tensile strength was generally satisfactory since the penetration of welding was almost complete due to the thinness of the materials. In addition, the formation of the welded area was excellent when it had the highest tensile strength.
파장분할다중방식 광통신망의 모니터링 방식에 관한 기술 동향
이우람,조승현,김봉규,박재동,김병휘,Lee, W.R.,Cho, S.H.,Kim, B.K.,Park, J.D.,Kim, B.H. 한국전자통신연구원 2004 전자통신동향분석 Vol.19 No.5
파장분할 다중방식 광통신망(WDM -PON) 운영의 신뢰성을 높이기 위해 각 광 채널의 파장과 파워, 그리고 광섬유로 이어진 링크(link)의 절단상태 등을 모니터링(monitoring)하는 것은 필수적이다. 본 원고에서는 이러한 목적을 효율적이고 경제적으로 달성하기 위해 제시되고 검증되었던 방법들을 pilot tone을 이용한 방법, AWG, FBG, tunable filter 등의 파장 선택성 소자를 이용한 방법, electrical processing을 이용한 방법 등의 세 가지로 나누어 소개한다.