The invention relates to an ultrasound welding device (1) for ultrasonic machining of a material by means of a sonotrode (2) mounted in a vibration-decoupled manner, which sonotrode comprises a sealing surface having a cylinder barrel shape, and a counter tool (8), wherein a converter is connected to the sonotrode (2) optionally via a first amplitude transformation unit and the sonotrode (2) and the first converter are designed in such a manner that the sonotrode (2) can be set into vibration by means of a natural vibration of the ultrasonic frequency fS.
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