Subscribe to our newsletter to receive the latest news and events from TWI:

Subscribe >
Skip to content

How can I attach connector components to stranded copper wire without using solder?


Frequently Asked Questions

As well as simple crimping processes, ultrasonic and resistance welding are used. When compared with soldering, the key benefits of these processes are reduction both in the materials costs and health & safety and disposal costs associated with solders and fluxes.

Resistance and ultrasonic welding work best for this application if a saddle-shaped electrode/sonotrode is used to prevent the strands from splaying as the weld is made. The geometry of the saddle feature must be suitable for the wire diameter, to prevent the electrode/sonotrode from touching down either side of the wire. If this happens, welding current (resistance welding) will have a secondary path to follow, resulting in a cooler weld. In the case of ultrasonic welding, the vibration energy will be absorbed into the machine anvil rather than being concentrated through the workpiece.

For further information please contact us.

For more information please email: