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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2010.1
- 수록면
- 967 - 974 (8page)
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초록· 키워드
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The resistance spot weldability of AZ31B magnesium alloy using AC (alternating current) was investigated in this paper. The surfaces of sheet coupons were prepared by acetone cleaning (as-received) and some coupons were also cleaned with chromic acid (H2Cr2O7) after acetone cleaning (acid-cleaned). The surfaces of the as-received AZ31B sheets consisted of MgO, Mg(OH)2, and MgCO3. The extent and thickness of the surface oxide/reaction layer of the sheets varied according to the fabrication process of the sheets, and resulted in different contact resistance. Effects of welding current and weld time were investigated while the electrode force was kept constant. The results indicated that the as-received sheets produced expulsion both at the faying surface and at the work piece/electrode interface due to high contact resistance. Diluted chromic acid cleaning reduced contact resistance and produced good weld quality. Increasing the welding current and weld time enhanced not only the nugget size and joint strength, but also increased indentation on the weld surfaces.
A weld lobe was established considering the minimum joint strength, weld expulsion, and surface indentation based on a relevant American Welding Society Standard.
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