15/10/2026
Many plastic assemblies are still joined with adhesive or screws. Both work. Both add something to the process: curing time, dosing equipment, surface preparation, extra parts and another variable to control.
Ultrasonic welding takes a different route. A sonotrode transmits high-frequency vibration, typically 20 to 40 kHz, into the parts. Friction at the joint interface melts the material locally, and under pressure it solidifies into a bond made from the parts’ own material. A typical weld cycle takes less than a second.
What changes in production:
• No consumables, no curing or drying time
• Parts can be handled immediately after welding
• Weld parameters can be monitored and logged for every cycle
• No foreign material in the joint, which simplifies recycling at end of life
Not every polymer or geometry welds the same way. Joint design, material pairing and fixturing decide the result. That is why we test real parts in our ultrasonic laboratory before anyone commits to tooling.
Considering a switch from adhesive on a plastic assembly? Talk to our engineers.
