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篇目详细内容 |
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【篇名】 |
Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel |
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【刊名】 |
Frontiers of Materials Science in China |
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【刊名缩写】 |
Front. Mater. Sci. China |
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【ISSN】 |
1673-7377 |
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【EISSN】 |
1673-7482 |
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【DOI】 |
10.1007/s11706-009-0007-2 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2009 |
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【卷期】 |
3
卷1期 |
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【页码】 |
78-83
页,共
6
页 |
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【作者】 |
San-bao LIN;
Jian-ling SONG;
Guang-chao MA;
Chun-li YANG;
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【关键词】 |
aluminum alloy/galvanized steel; TIG welding-brazing; intermetallic compound; microstructure; mechanical property |
【摘要】 |
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Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel was investigated, and the wettability and spreadability of aluminum filler metal on the steel surface were analyzed. The resultant joint was characterized in order to determine the brittle intermetallic compound (IMC) in the interfacial layer, and the mechanical property of the joint was tested. The results show that the zinc coated layer can improve the wettability and spreadability of liquid aluminum filler metal on the surface of the steel, and the wetting angle can reach less than 20°. The lap joint has a dual characteristic and can be divided into a welding part on the aluminum side and a brazing part on the steel side. The interfacial IMC layer in the steel side is about 9.0μm in thickness, which transfers from (α─Al+FeAl3) in the welded seam side to (Fe2Al5+FeAl2) and (FeAl2+FeAl) in the steel side. The crystal grain of the welded seam is obviously larger in size in the aluminum side. The local incomplete brazing is found at the root of the lap joint, which weakens the property of the joint. The fracture of the joint occurs at the root and the average tensile strength reaches 90MPa. |
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