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NTIS 바로가기大韓溶接·接合學會誌 = Journal of the Korean Welding and Joining Society, v.29 no.3, 2011년, pp.4 - 13
유호천 (한국과학기술정보연구원 ReSEAT 프로그램) , 김환태 (한국과학기술정보연구원 ReSEAT 프로그램)
초록이 없습니다.
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핵심어 | 질문 | 논문에서 추출한 답변 |
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저항 점용접의 문제점과 그 원인은 무엇인가? | 저항 점용접은 알루미늄 표면에 형성되는 강고한 산화피막의 영향, 전극재료와 알루미늄의 합금화가 원인으로 전극이 빨리 소모되고, 통전저해에 의하여 이음부 강도의 편차가 발생하며, 불균일한 너깃의 생성, 강재에 비하여 연속타점성이 뒤떨어지는 등의 문제점이 있다. 이를 해결할 수 있는 용접기술의 확보가 중요하다. | |
레이저용접의 장점은? | 고출력에 의한 고밀도 에너지로서 3차원 레이저용접 시스템 및 관련 장치 구축22)으로 인하여 빠른 용접속도와 용입깊이가 깊고 용융폭이 적기 때문에 열에 의한 변형이 적어 열영향부가 매우 좁다는 장점과 한쪽면에서의 용접이 가능하다. | |
알루미늄합금은 좁은 소성영역과 낮은 모재 강도의 특성으로 인해 용접시 어떤 문제가 발생하는가? | 알루미늄합금의 열전도율이 연강보다 약 3배 정도 높아서 용융부 주위의 온도상승에 의한 용접열손실이 크고 높은 전류를 필요로 하며 낮은 용융온도와 높은 전기전도도로 인하여 짧은 용접수행시간을 필요로 한다. 또한 소성영역(약 95~200℃)이 극히 좁고 모재의 강도가 낮으므로 용접시 전극가압력에 따른 용접물의 과도한 압흔(indentation) 등 용접불량이 발생하기 쉽다17). 일본 Nissan Motor Co. |
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