Ultrasonic welding uses high-frequency vibration to melt and weld plastic. A tool vibrates at ultrasonic frequencies and causes concentrated molecular vibration in the weld joint. The friction between the molecules heats and melts the plastic. Once the vibration is stopped, the tool maintains a holding pressure on the joint to create a bond.

Need design help?

We can help with that.


We have found that the major ultrasonic welder manufacturers have strengths with certain product offerings that we align with customer application expectations.

Something Special?

Are you performing additional sub-assemblies, component inspection, or other unique operations with the ultrasonic welding process...perhaps post weld leak-testing? You should know by now that customer 'specials' are never a problem at Extol - that's what we do.

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Solve your plastics-joining problems.

Whatever you're making with plastic, we can help you make it better and more efficiently.
Tell us about your project, and we'll show you how we can help.