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Indexed by:期刊论文

Date of Publication:2017-05-01

Journal:WELDING JOURNAL

Included Journals:SCIE、EI

Volume:96

Issue:5

Page Number:173S-184S

ISSN No.:0043-2296

Key Words:Aluminum Alloy; Steel; Arc Braze Welding (ABW); Microstructure; Intermetallic Compound

Abstract:Zn-15% Al and Al-12% Si flux-cored welding wires were deposited on five types of steel (Q235 and ST16 carbon steel as well as 304, 410, and 430 stainless steel) sheets with different alloying elements content and microstructures using the gas tungsten arc welding process. Lap joining 5052 aluminum alloy to ST16 low carbon steel and 304 stainless steel sheets was also conducted with these two welding wires. Spalling of the intermetallic compounds (IMCs) layer occurred, and fine Fe-Al-Zn IMCs integrated with Zn-Al solid solution when Zn-15% Al flux-cored welding wire was used. The results indicate that Cr in stainless steel could effectively restrain the detachment of Fe-Al-Zn IMCs and growth of the interfacial layer compared to carbon steels. However, Cr could not restrain the spalling of Fe-Al-Si IMCs. The shape of IMCs containing Cr turned block like instead of needle like when Al-12% Si flux cored welding wire was melted on a stainless steel surface. Reducing welding heat input could completely suppress the spalling of Fe-Al-Zn IMCs, and the thickness of the interfacial layer also decreased. However, reducing welding heat input could restrain but not completely eliminate the spalling of Fe-Al-Si IMCs. During welding, the arc should not directly exert on the steel surface, since the arc force could facilitate diffusion of Fe and Cr to the weld and promote formation of Fe-Al-Si and Fe-Al-Zn IMCs.