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Interface microstructure and mechanical properties of arc spot welding Mg-steel dissimilar joint with Cu interlayer


Indexed by:期刊论文

Date of Publication:2014-07-01


Included Journals:SCIE、EI


Page Number:369-376

ISSN No.:0261-3069

Key Words:Ferrous metals and alloys; Welding; Microstructure

Abstract:A novel technology was developed for the arc spot welding of AZ31 Mg alloy to Q235 steel with Cu as interlayer. The mechanisms of bonding dissimilar materials were investigated using mechanical and metallurgical examinations. Results show that the joining of Mg alloy to steel with Cu involved two bonding mechanisms: weld-brazing by the Cu transition layer at the interface edge and bonding by a micron-scale composite transition layer of Al3Cu4Fe3 and Fe4Cu3 intermetallic phases at the interface center. The additional reaction of Cu increased the reaction temperature and composition ranges at the interface. It also elicited a bridge effect that improved the weldability of Mg alloy and steel by new formed phases. (C) 2014 Elsevier Ltd. All rights reserved.

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