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Realization of Al/Mg-hybrid-joints by ultrasound supported friction stir welding - mechanical properties, microstructure and corrosion behavior

 
: Straß, Benjamin; Wagner, Guntram; Conrad, Christian; Wolter, Bernd; Benfer, Sigrid; Fürbeth, Wolfram

:

Groche, Peter:
Tribology in Manufacturing Processes & Joining by Plastic Deformation : Selected, peer reviewed papers from the 6th International Conference on Tribology in Manufacturing Processes & Joining by Plastic Deformation, ICTMP 2014, June 22-24, 2014, Darmstadt, Germany
Dürnten: Trans Tech Publications, 2014 (Advanced materials research 966-967)
ISBN: 978-3-03835-127-6 (Print)
ISBN: 978-3-03795-823-0 (CD-ROM)
ISBN: 978-3-03835-127-6 (Print+CD-ROM)
ISBN: 978-3-03826-510-8 (eBook)
pp.521-535
International Conference on Tribology in Manufacturing Processes & Joining by Plastic Deformation (ICTMP) <6, 2014, Darmstadt>
Deutsche Forschungsgemeinschaft DFG
SPP 1640; Joining by Plastic Deformation
English
Conference Paper
Fraunhofer IZFP ()
aluminium; corrosion behavior; electrochemical measurement; Friction stir welding (FSW); intermetallic phase

Abstract
Fusion welding of dissimilar metals is in the most cases difficult or even impossible as a result of different melting points and the development of undesirable brittle intermetallic phases. This often leads to joint strengths considerable below the tensile strength of the base materials. By using Friction Stir Welding (FSW) it is possible to reduce the development of the intermetallic phases of Al/Mg-joints significantly but not to avoid them completely. Hence a hybrid welding system at the WKK of the University of Kaiserslautern was developed called "Ultrasound Supported Friction Stir Welding (US-FSW)" with the aim to shatter the brittle interlayer lines and to scatter fragments in the welding area during the FSW process. Pre-investigations have shown that for Al/Mg-US-FSW-joints the strength can be increased up to 30% in comparison to conventional FSW. Moreover for the reliable detection of nonconformities in the weld during a post-process inspection by suitable non- destructive testing (NDT) methods is necessary. Also there is a strong need for better process monitoring and control by in-process NDT methods. Furthermore the corrosion behavior of the basic materials and hybrid-joints was investigated by electrochemical methods indicating an increased corrosion of the Mg alloy in the area of the Al/Mg-butt weld.

: http://publica.fraunhofer.de/documents/N-301223.html