Comparative Study of Bypass-Current MIG Welded-Brazed Aluminum/Galvanized Steel and Aluminum/Stainless Steel

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-disp...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2017-08, Vol.30 (8), p.721-730
Main Authors: Miao, Yu-Gang, Chen, Guang-Yu, Zhang, Peng, Han, Duan-Feng
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Braze welding
Characterization and Evaluation of Materials
Chemistry and Materials Science
Comparative studies
Corrosion and Coatings
Energy consumption
Filler materials
Friction stir welding
Friction welding
Galvanized steel
Galvanized steels
Galvanizing
Gas flow
Gas welding
Interface reactions
Intermetallic compounds
Iron
Materials Science
Metallic Materials
Microhardness
Nanotechnology
Optical microscopy
Organometallic Chemistry
Scanning electron microscopy
Spectroscopy/Spectrometry
Spectrum analysis
Stainless steel
Stainless steels
Thickness
Tribology
Zinc
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Summary: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 5-45μm 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.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-017-0578-3