Ultrasonic torsion welding of ageing-resistant Al/CFRP joints: Properties, microstructure and joint formation

Florian Staab; Frank Balle

doi:10.1016/j.ultras.2018.11.006

Ultrasonic torsion welding of ageing-resistant Al/CFRP joints: Properties, microstructure and joint formation

Ultrasonics. 2019 Mar:93:139-144. doi: 10.1016/j.ultras.2018.11.006. Epub 2018 Nov 22.

Authors

Florian Staab¹, Frank Balle²

Affiliations

¹ University of Freiburg, Walter and Ingeborg Herrmann Professorship for Engineering of Functional Materials (EFM), Department for Sustainable Systems Engineering (INATECH), Faculty of Engineering, 79110 Freiburg, Germany. Electronic address: http://www.inatech.uni-freiburg.de.
² University of Freiburg, Walter and Ingeborg Herrmann Professorship for Engineering of Functional Materials (EFM), Department for Sustainable Systems Engineering (INATECH), Faculty of Engineering, 79110 Freiburg, Germany.

PMID: 30521993
DOI: 10.1016/j.ultras.2018.11.006

Abstract

Ultrasonic metal welding is a promising process for joining light metals with fiber-reinforced thermoplastics. The technique is characterized by high reproducibility, short process times, low energy input, no additional filler materials and finally the possibility of extensive process data logging. With this process, dissimilar aerospace materials are ultrasonically welded and the applied process parameters are optimized by statistical methods. A prediction of ageing resistance is possible by the evaluation of the electrical resistivity of the multi-material-joints. With the help of detailed process parameter recording and microscopic investigations, the bonding mechanism of hybrid AA5024/(GF-)CF-PEEK joints is explained and the kinematics of bonding formation is presented in detail.

Keywords: Ageing resistant; Aluminum; Fiber reinforced thermoplastics; Hybrid structures; Multi-material-design; Ultrasonic welding.