Ultrasonic Welding

Areas of Application
Materials suited for ultrasonic welding include thermoplastics and so-called non-ferrous metals, such as copper, brass, and their alloys.

Principal Function of Ultrasonic Welding Technology
During ultrasonic welding, the electrical oscillations created by the generator are transformed into mechanical oscillations using a converter (sonic transducer).
Any required amplitude transformer (also called a booster) transforms the oscillation furnished by the converter (analogue to an electrical transformer). These oscillations are supplied to the connecting work pieces by means of a so-called sonotrode (welding tool).

Here, the mechanical dimensions of the converter, the booster, and the sonotrode are adapted to the output frequency of the generator.

Through the reflection of the mechanical oscillations to the sound-emitting end face of the sonotrode, a standing wave that transfers the energy to the work pieces forms.

Frequencies
Typical frequencies used in ultrasonic welding are 20 kHz, 35 kHz, and 40 kHz. More seldom, a frequency of 15 kHz and systems with a frequency of 70 kHz are also used.