Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 29: Microstructure and Phase Transformations
MM 29.10: Vortrag
Mittwoch, 3. April 2019, 17:30–17:45, H46
How material structure and properties of Al-Cu Friction Stir Welding seams depend on process parameters — •Roland Marstatt1, Amanda Zens2, Sophie Grabmann2, Michael Friedrich Zaeh2, and Ferdinand Haider1 — 1Chair for Experimental Physics I, University of Augsburg, Universitätsstraße 2, 86159 Augsburg, Germany — 2Institute for Machine Tools and Industrial Management (iwb), Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany
Joining of different metals, for instance of aluminium and copper, is of great industrial interest for applications in light weight construction and electromobility. In contrast to fusion welding techniques, Friction Stir Welding (FSW) does not form a multitude of brittle intermetallic phases upon joint solidification. Only a small layer of intermetallic phases is formed at the interface. Those layers are in the nanometer regime and are the key joining mechanism. In this study, the material structure, especially the intermetallic interface layers, of Al-Cu lap joints are compared with respect to variations of several welding parameters. Therefore aluminium and copper had been welded in temperature controlled mode as well as constant rotational speed mode. The set temperature respectively the set rotational speed had been varied over the possible process window. Also tool velocity, tool length and seam geometry had been varied. The structure of the intermetallic layers, especially its thickness, was measured by electron microscopy and compared to the results of corresponding shear tensile tests with respect to the process variations.