November 3, 2026 · admin
Choosing the right power rating is one of the most important steps when buying an ultrasonic plastic welding machine. Too little power gives weak or incomplete welds; too much can mark, burn or damage the part. Power is not chosen on its own, though. It works together with frequency, horn design and the part itself.
What Affects the Power You Need
- Weld area: larger or longer joints need more energy than small spot or short seams.
- Material: semi-crystalline plastics such as PP and PE generally need more energy than amorphous plastics such as ABS. See ABS vs PP welding.
- Joint design: an energy director or shear joint changes how much power is needed.
- Distance from horn to joint: parts that need far-field welding need more power than near-field welding.
- Cycle time: shorter cycles at the same weld energy need higher power.
Power and Frequency Work Together
Lower-frequency machines such as 15kHz typically suit larger parts and higher power, while 20kHz machines are the common general-purpose choice. See our 15kHz vs 20kHz comparison.
A Practical Way to Choose
- Collect your part drawing or sample, the plastic grade and the weld area.
- Decide the cycle time and production volume you need.
- Ask the supplier to recommend frequency and power based on that information.
- Confirm with a sample trial where possible before ordering.
Do Not Choose Power Only by the Number
A higher wattage figure does not guarantee a better weld. The horn, booster, fixture and weld settings matter as much. For help, see our ultrasonic plastic welding machines or contact JSB Ultrasonic with your component details.
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