08. July 2015

RECENDT: Electromagnetic Joining Technology in EU Project

As experts in non-destructive testing and material characterization, Linz company RECENDT is working on non-destructive testing of electromagnetic joining technology as part of the EU project "JoinEM", funding programme HORIZON 2020.

When joining dissimilar materials (such as copper and aluminium) conventional techniques often reveal their limitations (formation of unwanted oxides, materials with different melting points, etc.). The current high copper price and the continuing trend towards lightweight construction mean that there is a real need for joining techniques that allow the partial substitution of copper with aluminium.

Joining pieces using electromagnetic forming (also known as electromagnetic pulse technology) is an innovative technology that makes such tasks possible. Electromagnetic forming is a high-velocity forming process with which plate and profile-shaped work pieces made of electrically conductive materials can be both reshaped and joined by forming. Forming is effected by pulsed magnetic fields, which means there is no mechanical contact between the tools and the work piece. With the aid of electromagnetic forming, combinations of both similar and dissimilar materials can be joined non-positively by elasto-plastic stretching of the components to be joined, positively by forming undercuts or materially using a cold welding process (EMW – electromagnetic welding).   

As experts in non-destructive testing, RECENDT is responsible for the characterization of the joints on the project and is also in charge of the work package for the development of testing methods for joint characterization. Among the non-destructive testing methods to be employed is laser ultrasound (LUS).