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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
대한용접·접합학회 대한용접학회 특별강연 및 학술발표대회 개요집 대한용접학회 2008년도 추계 학술발표대회 개요집 제50권
발행연도
2008.11
수록면
14 - 18 (5page)

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Dissimilar materials lap joining of automotive aluminum alloy 6111 and low carbon steel was carried out using several advanced joining methods: a defocused laser welding (DLW), friction stirring welding (FSW) and magnetic pulse welding (MPW). Their mechanical properties and interfacial microstructure were precisely investigated by TEM and TEM-EDX. In DLW-ed joints, interfacial layer consisted of very fine intermetallic compound (IMC) such as Al13Fe4, Al5Fe2, Al2Fe, FeAl, Fe3Al and Al6Fe. Formation and growth manner of IMCs was investigated by an interrupted welding method. It was revealed that Al13Fe4 and Al2Fe forms at the early stage of welding process, and then Al5Fe2 forms between them and preferentially grows up. Abrupt growth of Al5Fe2 decreases the weld strength was also confirmed. The dominant factor controlling the interfacial microstructure is considered to be the post-weld thermal history. FSW-ed joints showed laminated interfacial structure. It was clarified that the laminate structure consists of the periodical arrangement of refined Fe grains and the mixture of refined Fe and Al grains. EMSW-ed joints showed characteristic wavy interfacial microstructure. Careful TEM observation and diffraction pattern analysis revealed that the intermediate phase layer consists of an amorphous including extremely fine Al grains. Ultra-refined grain structure less than 100㎚ was also observed in the Al matrix close to the weld interface.

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Abstracts
1. Introduction
2. Result and Discussion
Referance

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