An oscillating structure consists of a converter, amplitude transformation piece and sonotrode. The converter is the interface between the electrical and mechanical parts. It converts electrical vibration into mechanical vibration via the piezoelectric effect and transfers it to the amplitude and then to the sonotrode. The amplitude transformation piece (also called booster) increases or decreases the amplitude originating from the converter. As the actual welding tool, the sonotrode transmits the mechanical vibration into the component. The oscillating structure is always individually adapted or aligned to the component.