Plastic Welding Guide

Ultrasonic Plastic Welding Machine Frequency Guide

Frequency selection is one of the first decisions in ultrasonic plastic welding. It affects horn size, amplitude, audible noise, weld area, part stress and cosmetic results.

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15kHz and 20kHz welding

15kHz and 20kHz systems are often used for larger plastic parts, higher amplitude requirements and bigger weld areas. They are common in automotive parts, filters, containers and structural plastic assemblies.

35kHz and 40kHz welding

35kHz and 40kHz systems are often selected for smaller, precision or cosmetic parts. They can reduce visible marking and are common for electronics, medical components and small housings.

How to confirm the right frequency

Material, joint design, wall thickness, weld area, strength target, appearance requirements and automation method should be reviewed together. A welding trial with the real part is the most reliable confirmation.

Frequently Asked Questions

Which frequency is best for plastic welding?

There is no universal best frequency. Larger parts often use 15kHz or 20kHz, while smaller precision parts often use 35kHz or 40kHz.

Can one machine weld different plastics?

Yes, if tooling and parameters are changed, but material compatibility and joint design still determine weld quality.

What information is needed for a welding trial?

Material grade, part drawings, joint design, target strength, surface requirements and production cycle time are the most useful inputs.

Need to confirm a machine configuration?

Send product photos, target portion size, cycle time and line conditions. An engineer will review blade, frequency and automation options.

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