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Development Trend and Application of Peening Technology to Improve Welding Joint Life
조인식,송승현,김재성,구병춘 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Welding processes in various industries such as shipbuilding, railroads, aircraft, and construction are inevitably accompanied by HAZ(Heat Affected Zone) deformation and metal structure changes around the toe of the welding bead. It is widely known that it is very weak in terms of structural strength because the tensile residual stress is introduced by welding, and the surface is also rough, causing the main cause of stress concentration to occur. It also becomes the damage initiation cite to the welded structure. Post-welding heat treatment, grinder, and TIG dressing methods were used to release residual stress and to eliminate defects in the welding part. Recently, various peening technologies using pulsed heat sources of laser, elastic vibration energy of ultrasonic waves, compressed air or cavitation have been developed and are being actively utilized as performance improvement and standardized safety technologies in the field. The local peening process on the surface of the welded part and the welded heat-affected part is not only easily portable by various technical methods, but is also being applied to robots or hybrid-3D printing technology. Therefore, in this technical paper, the technical analysis of the various advanced peening technologies that are currently being utilized and the device development trend are evaluated. The portable ultrasonic peening equipment was developed and the recently applied technologies that are newly grafted to improve mechanical properties are introduced.
SF-4 Flint Glass를 이용한 자기광학적 전류측정시스템에 관한 연구
조인식,김은수,양인응,Jo, In-Sik,Kim, Eun-Su,Yang, In-Eung 대한전자공학회 1985 전자공학회지 Vol.22 No.3
본 논문에서는 SF-4 flint glass를 이용한 fiber-optic 전류센서의 가능성을 처음으로 제시하였고 이를 실현하기 위하여 Jones matr항에 의한 이론적 분석과 실험을 하였다. 전류측정센서의 감도를 결정하는 SF-4 flint glass의 verdet 상수는 측정결과 0.0606[min/G·㎝]로 현재 연구 보고된 전류센서용 파라데이 회전자인 FR-5, SF-6 flint glass 및 YIC보다 비교적 작은 간으로 나타났다. 그리고 이론모델을 토대로 전류측정 시스템을 구성하여 100∼600(A)의 상용전류 및 100∼500(C)의 자계를 변화 시킴에 따라 검출기 출력을 측정한 결과 선형적으로 나타났다. 이는 이론적 결과와도 일치함 이 분석 되므로써 본 논문에서는 SF-4 flint 멍ass가 전류센서로서의 응용 가능성을 제시 하였다. This paper describes fiber-optic current sensor using SF-4 flint glass for the first time, ails the flint glass has been theoretically analyzed by jones matrix and experimentally verified. Verdet constant of SF-4 flint glass, which determines the sensitivity of current sensor, has been experimentally found as 0.0606(min/g.cm). It is relatively lower value than currently used faraday rotators such as FR-5, SF-6 flint glasses and YIG. The fiber.optic current sensor system was established and the current measurement was performed in the range of 100-600 (A) and 100- 500 (G). It has beenfhown by the experi-mental results that the detector output linearly increased in proportion to the current. Since these experimental results were in good agreement with theoretical results, it has been shown that SF-4 flint glass can be used for the magnetooptic current sensor.
초음파탄성진동에너지를 이용한 표면개질처리 및 가속피로수명평가 기술의 적용사례 및 응용기술
조인식,조인호,오주연,이창순,편영식,박인규,Jo, In-Sik,Jo, In-Ho,Oh, Joo-Yeon,Lee, Chang-Soon,Pyoun, Young-Sik,Park, In-Gyu 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
It is greatly expected that the technologies of durability enhancement and evaluation for the core structures of plant facilities, marine plant and bridge constructures will be greatly expanded in the plant industry fields. In this study, the actively ongoing applied cases were tried to be analyzed in the present domestic industry fields through the Ultrasonic Nanocrystalline Surface Modification (UNSM) and Ultrasonic Fatigue Test (UFT) technologies using ultrasonic elastic vibrational energy, and the new application technology to improve the durability of plant industry field, especially plant facilities, marine plant and core weld components of bridge constructures will be presented. 최근 플랜트산업분야에서는 발전설비와 해양 플랜트 및 선박, 교량 건설등 핵심 구조물들에 대한 내구성 향상 및 평가를 위한 기술이 크게 확장 적용될 것으로 본다. 이에 본 연구에서는 초음파 탄성진동에너지를 이용한 초음파 나노표면개질(Ultrasonic Nanocrystalline Surface Modification) 기술과 초음파 피로시험(Ultrasonic Fatigue Test)기술을 통해서 현재까지 국내산업분야에서 활발하게 진행중인 적용사례를 분석하고자 하였으며. 플랜트분야 특히 발전설비와 해양선박 플랜트 및 교량 건설구조물들의 핵심 용접부에 대한 내구성 향상을 위해 크게 확장 적용될 수 있는 새로운 응용기술 연구방향에 대한 방법들을 제시하고자 한다.