Enhancement of the interface of friction welded steel-aluminium joints

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Behrens, B.-A.; Duran, D.; Matthias, T.; Ross, I.: Enhancement of the interface of friction welded steel-aluminium joints. In: Production Engineering 15 (2021), S. 169-176. DOI: https://doi.org/10.1007/s11740-020-00994-5

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Sum total of downloads: 53

Lightweight multi-material components are of great importance for the transport industry. Not only the component’s weight can be decreased, but also its local properties can be adapted to different loading profiles. Tailored Forming is a novel concept for producing multi-material components. By using a joining process, the creation of a bond between different materials takes place in the first step of the process chain. In the subsequent steps, multi-material workpieces are processed in their joined state while maintaining or improving the joint strength. This study focuses on steel-aluminium joints, which were created by friction welding and further processed by induction heating and impact extrusion. A counter pressure superposition mechanism was implemented in the extrusion tooling to control the stress state during plastic deformation. Flow behaviours of steel and aluminium are largely different at a given temperature, which necessitates a near step-function temperature distribution in the hybrid billet to obtain matching flow stresses. An inductive heating strategy was developed which led to a temperature gradient in the billets before extrusion. Extruded billets were analysed by destructive testing methods and metallography. The bond could be maintained after extrusion when counter pressure superposition was used; but no improvement could be obtained. Without counter force superposition, however, cracks were observed in the joining interface and the joint strength decreased. This paper discusses the aforementioned findings in the current process design and makes suggestions on how the involved processes should be reconfigured to improve the joint strength. © 2020, The Author(s).
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2020
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
total perc.
1 image of flag of Germany Germany 27 50.94%
2 image of flag of United States United States 14 26.42%
3 image of flag of China China 5 9.43%
4 image of flag of Hong Kong Hong Kong 2 3.77%
5 image of flag of France France 2 3.77%
6 image of flag of Taiwan Taiwan 1 1.89%
7 image of flag of Oman Oman 1 1.89%
8 image of flag of Europe Europe 1 1.89%

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