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Weldability Testing of Hard Deformable Aluminum Alloys Intended for Extrusion

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Weldability Testing of Hard Deformable Aluminum Alloys Intended for
Extrusion through Porthole Dies

Dariusz Lesniak, Jan Richert, Wojciech Libura, Marcin Mroczkowski, Jakub Sobota,
AGH University of Science and Technology, Cracow, Poland

Track: EXTRUSION/DIE PRACTICAL - Dies, Inserts, and Coatings

ABSTRACT—The extrusion of hollow shapes from high-strength aluminum alloys with the use
of porthole dies encounters, in practice, great difficulties, mainly due to the poor weldability of
these materials and the high forces needed to conduct the process. In the work, an original method
and a special device are presented, which enable the welding conditions of hard deformable
aluminum alloys to be determined. The main advantage of the proposed method is that it
simulates the conditions occurring in the welding chamber of the porthole dies. The weldability
tests were performed for the 2024 alloy with extreme contents of copper (Cu) and magnesium
(Mg), in a wide range of welding temperatures and pressures. The microstructure and the seam
welds’ strength were also examined. The welding conditions for 2024 alloy, which allowed for
obtaining high-quality seam welds, were determined. The parameter describing the ability to weld
was defined as the stress necessary for the welding to the yield stress ratio (σw/k), and was
determined for the analyzed alloys. The obtained welding stress values will be the basis for the
porthole die design.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.