Comparative Study of Bypass-Current MIG Welded–Brazed Aluminum/Galvanized Steel and Aluminum/Stainless Steel
来源期刊：Acta Metallurgica Sinica2017年第8期
论文作者：Yu-Gang Miao Guang-Yu Chen Peng Zhang Duan-Feng Han
文章页码：721 - 730
摘 要：A bypass-current metal inert-gas welding–brazing technology has been developed to join aluminum/galvanized steel and aluminum/stainless steel. Microstructure, intermetallic compounds and hardness distribution of the joints were studied by optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis and microhardness tests. Comparative study on both types of joints was carried out. During aluminum to galvanized steel assembling, finer seam was obtained under a more stable process. A uniform interfacial reaction layer with a thickness of 2–4 μm was formed. During aluminum to stainless steel assembling, an uneven interfacial reaction layer with a thickness of 5–45 μm was formed. Intermetallic compounds at the interface of aluminum/galvanized steel were identified as Fe–Al–Si–Zn complex phases, while Fe–Al–Cr–Ni complex phases were found at the aluminum/stainless steel interface.Microhardness of interfacial layer increases rapidly within reaction layer due to possible brittle intermetallic compounds.
Yu-Gang Miao，Guang-Yu Chen，Peng Zhang，Duan-Feng Han
National Key Laboratory of Science and Technology on Underwater Vehicle, Harbin Engineering University
摘 要：A bypass-current metal inert-gas welding–brazing technology has been developed to join aluminum/galvanized steel and aluminum/stainless steel. Microstructure, intermetallic compounds and hardness distribution of the joints were studied by optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis and microhardness tests. Comparative study on both types of joints was carried out. During aluminum to galvanized steel assembling, finer seam was obtained under a more stable process. A uniform interfacial reaction layer with a thickness of 2–4 μm was formed. During aluminum to stainless steel assembling, an uneven interfacial reaction layer with a thickness of 5–45 μm was formed. Intermetallic compounds at the interface of aluminum/galvanized steel were identified as Fe–Al–Si–Zn complex phases, while Fe–Al–Cr–Ni complex phases were found at the aluminum/stainless steel interface.Microhardness of interfacial layer increases rapidly within reaction layer due to possible brittle intermetallic compounds.
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