What the study found
The study found that the integrity of cable-arrester joints depended strongly on cable length during ultrasonic metal welding, a process that joins metals with high-frequency vibrations. Certain lengths showed robust behavior, while others showed degraded or failed joints.
Why the authors say this matters
The authors say this matters because ultrasonic metal welding is used for lightweight electrical connections in the transportation industry, including electric vehicles. The study suggests that understanding vibration propagation is needed to ensure process reliability and avoid damage to existing joints.
What the researchers tested
The researchers studied stranded aluminum wire connected to copper terminals and welded at both ends with linear ultrasonic metal welding. They tested cable lengths from 150 to 1000 mm using laser vibrometry, high-speed video, tensile shear testing, and a scaled finite element model in ANSYS Workbench.
What worked and what didn't
Mechanical testing showed robust joints at 300 mm, non-weldable behavior at 225 mm, and isolated failures at 150 mm and 375 mm. Longer cables showed no indications of joint degradation. Laser vibrometry showed vibration amplitudes decreased with increasing length because of damping, while critical lengths showed amplitude and phase shifts linked to weld degradation.
What to keep in mind
The abstract does not describe broader limitations beyond the tested materials, joint type, and cable-length range. The finite element model was scaled and validated against the experimental data, but the summary does not state whether the findings apply to other materials or welding setups.
Key points
- Cable length had a strong effect on joint integrity during ultrasonic metal welding.
- Robust joints were reported at 300 mm, while 225 mm showed non-weldable behavior.
- Isolated failures occurred at 150 mm and 375 mm, but longer cables showed no joint degradation.
- Vibration amplitudes decreased with increasing cable length because of damping.
- Relative phase shifts were identified as the primary cause of joint failure.
Disclosure
- Research title:
- Cable length affects vibration damage in welded connections
- Authors:
- Kai Ehlich, Moritz Kranz, Michael Hasieber, Jean Pierre Bergmann
- Institutions:
- Technische Universität Ilmenau, Technische Universität Ilmenau, Technische Universität Ilmenau, Technische Universität Ilmenau
- Publication date:
- 2026-03-05
- OpenAlex record:
- View
Get the weekly research newsletter
Stay current with peer-reviewed research without reading academic papers — one filtered digest, every Friday.