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Main Title: Revealing joining mechanism in refill friction stir spot welding of AZ31 magnesium alloy to galvanized DP600 steel
Author(s): Fu, Banglong
Shen, Junjun
Suhuddin, Uceu F.H.R.
Pereirav, Ayrton A.C.
Maawad, Emad
Santos, Jorge F. dos
Klusemann, Benjamin
Rethmeier, Michael
Type: Article
Abstract: The application of magnesium (Mg) inevitably involves dissimilar welding with steel. A novel solid state spot welding method, refill friction stir spot welding (refill FSSW), was utilized to weld AZ31 Mg alloy to galvanized DP600 steel. Although Mg/Fe is an immiscible alloy system, defect-free welds with high strength were successfully obtained in a wide parameter window. The results of microstructure, interfacial reactions, and mechanical properties are reported to reveal the underlying joining mechanism. Due to the melting of Zn coating and subsequent Mg-Zn reactions, Mg-Zn eutectic and intermetallic compounds were detected within welds. Heterogeneous interfacial reactions occur along Mg/steel interface, and the relationship between interfacial structure and fracture behavior was investigated. The joining mechanism is associated with Zn coating and Fe-Al layer: 1) the presence of Zn coating is beneficial for achieving high-quality welding between Mg and steel, it protects the interface from oxidation and contributes to brazing of the weld; 2) the Al present in Mg alloy reacts with Fe, resulting in the growth of Fe-Al layer, which contributes to the diffusion bonding in the interface. The overall results clearly show that refill FSSW is a competitive welding method for joining Mg and galvanized steel.
Subject(s): refill friction stir spot welding
multi-materials joining
magnesium alloy
galvanized steel
mechanical properties
Issue Date: 22-Jul-2021
Date Available: 12-Nov-2021
Language Code: en
DDC Class: 600 Technik, Technologie
Journal Title: Materials & Design
Publisher: Elsevier
Volume: 209
Article Number: 109997
Publisher DOI: 10.1016/j.matdes.2021.109997
ISSN: 0264-1275
TU Affiliation(s): Fak. 5 Verkehrs- und Maschinensysteme » Inst. Werkzeugmaschinen und Fabrikbetrieb » FG Fügetechnik
Appears in Collections:Technische Universität Berlin » Publications

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