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High Frequency welding

Joining process where the electrodes create heat, pressure, electromagnetic fields and vibrations. The method is suitable for plastics.

Illustration of High Frequency welding

The process

Two workpieces [1] are placed between two metal electrodes [2]. An external voltage of high frequency is then coupled to the electrodes, creating an electromagnetic field. When the electrodes are pressed together the molecules in the materials vibrate and heat up. This leads to the workpiece surface melting and along with with the applied pressure, causes them to be joined at the contact point [3]. After the seam has been partially cooled, the pressure is removed and the processing is completed.