COMMIT - Electrical interconnects designed for improved thermal- and mechanical fatigue life

Important results from the project

In the COMMIT project, equipment and testing methodology were developed to fatigue test laser-welded aluminum joints and resistance-welded copper joints under current load. The project also developed proposals for standardized test specimens. Furthermore, high-resolution 3D CT X-rays proved to be effective in identifying cracks and pores in the welds. FEM simulation was also performed. In general, most specimens passed accelerated fatigue testing despite cracks and pores in the welds.

Expected long term effects

In order to develop both materials and joining processes for current-conducting joints, it is necessary to have an adapted testing methodology, which has been developed in the COMMIT project. Thus, the COMMIT project has laid the foundation for further development of materials and processes for current-conducting joints.

Approach and implementation

The project was led by Swerim, where most of the testing was also carried out. The welding tests and FEM simulation were carried out by project partners in dialogue with Swerim. Regular project meetings were held and as a complement also regular meetings with the individual project partners.