HomeNewsChoosing Between 15 kHz And 20 kHz Ultrasonic Welding Machines

Choosing Between 15 kHz And 20 kHz Ultrasonic Welding Machines

A practical look at how frequency affects amplitude, part size suitability and weld quality — and how to pick the right one for your application.

Ultrasonic frequency is one of the first specifications to settle when choosing a welding machine, and it has a direct effect on amplitude, weld strength and the size of part you can process cleanly.

15 kHz machines run at a lower frequency but deliver higher amplitude and more energy per cycle, which makes them well suited to larger, thicker-walled or rigid components — automotive housings, geyser bodies and large storage containers are common examples in our range.

20 kHz machines are more general-purpose. The higher frequency delivers a finer, more controlled weld that works well across a wide range of part sizes, and it's the frequency we recommend most often for chargers, connectors, packaging components and mid-size plastic assemblies.

In practice, the right choice depends on part geometry, wall thickness, joint design and the finish you need — not frequency alone. Our team regularly reviews customer samples or drawings before recommending a configuration, so you're not guessing between the two.

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