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홍태민,윤광희,강중규,이희근 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
대형 선박 및 해양플랜트 구조물의 탑재 조립 단계에서 발생하는 수직 맞대기 이음부 용접에는 고능률 1패스 용접이 가능한 EGW (Electro Gas Welding) 기법이 보편적으로 적용되어왔다. 현재 적용되고 있는 EGW 장치는 사전에 용접선을 따라 철판에 여러 개의 레일을 부착하고 무거운 용접주행장치를 곤도라 위에서 레일에 체결하여 사용하기 때문에 항상 설치 및 해체 작업이 필요하고 고소 작업 중 안전 문제가 발생하여 무레일 EGW 용접 장치 개발이 요구되었다. 본 연구는 수직 맞대기 용접부를 1패스 용접이 가능한 무레일 EGW 장치를 연구 개발하여 실제 생산에 적용 가능한 기술개발을 목적으로 하였으며, 직선부의 용접뿐 만 아니라 선박의 선수 선미 의 곡선부 용접까지 가능한 기술 개발을 목적으로 하였다.
홍태민 ( Tae Min Hong ),이지은 ( Ji Eun Lee ),홍영기 ( Young Ki Hong ),이정순 ( Jung Soon Lee ),조대현 ( Dae Hyun Cho ),이승구 ( Seung Goo Lee ) 한국접착및계면학회 2013 접착 및 계면 Vol.14 No.3
The prepreg material is a sheet of the reinforcement pre-impregnated with a resin. In this study, two types of prepreg were prepared with a general phenolic resin and the polyvinyl butyral (PVB) modified phenolic resin, respectively, with resin content of 40 wt%. After resin impregnation, the prepregs were heat treated in an oven to make them the B-stage. Surface morphology of the prepreg was observed by using a scanning electron microscope (SEM). Tack property of the prepreg is one of the major properties that govern the ability of prepreg to be laid up. In this study, the tack of prepreg was measured under various test parameters by a probe tact test. Test parameters were contact time, contact force and debonding rate. Most of the tack properties of the prepreg increased with the test parameters. Then tack properties exhibited a linear behavior with test parameters before a saturation point. Also, the tack of prepreg was investigated in relation with the fibrillation phenomena involved in the prepreg surface with the debonding rate.
김상필,홍태민,장희석 대한용접접합학회 1994 대한용접·접합학회지 Vol.12 No.4
Resistance spot welding has been widely used in the sheet metal joining processes because of its high productivity and convenience. In the resistance spot welding processes the size of molten nugget is a criterion to assess weld quality. Many research have founded on measuring weld nugget size at the same time monitoring welding process parameters such as dynamic resistance and electrode movement. With increasing demand of energy saving, many efforts were made to employ aluminum alloys that are lighter than steel and have relatively equivalent strength to steel in the automobile industry. In this paper, spot weldability of aluminum alloys for various welding conditions were examined by series of experiments. One of the 6000 series (Mg-Si) aluminum alloy, 6383-T4 was chosen, which is currently considered as a substitute for the galvanized steel. Dynamic resistance, electrode movement and corresponding nugget size were observed and compared to the case of steel. Finally, resistance spot welding of dissimilar material (galvanized steel-aluminum alloy) was attempted.