Microstructure and Mechanical Properties of Refill Friction Stir Spot Welding of AM50 Cast Magnesium Alloy
Berichte aus dem Produktionstechnischen Zentrum Berlin
Banglong Fu
Hrsg.: Michael Rethmeier; Fraunhofer IPK, Berlin; TU Berlin, Institut für Werkzeugmaschinen und Fabrikbetrieb -IWF-
2022, 197 S., num., mostly col. illus. and tab., Softcover
Sprache: Englisch
Berlin, TU, Diss., 2022
Fraunhofer Verlag
ISBN 978-3-8396-1865-3

Inhalt
Magnesium (Mg) alloys have been considered as an important material in aerospace, sport, electrical, railway systems and, most importantly, in automotive industry, which comprises 80% of Mg usage. In order to enlarge its usage, appropriate welding methods should be investigated. Refill friction stir spot welding (refill FSSW) is a novel solid-state welding technology. Due to the significant merits of keyhole-free weld, improved mechanical properties, etc., it has been successfully used for the welding of Al-based similar and dissimilar combinations. However, studies concerned with Mg alloys are limited. The feasibility of refill FSSW of casting Mg alloy AM50 was investigated firstly. Defect-free welds with flat surface and high performance were obtained successfully. Moreover, a modified method, differential rotation refill FSSW (DR-refill FSSW), was developed. DR-refill FSSW provides a new and effective strategy for improving the performance of spot welds based on microstructural engineering.

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