US 13595208 A description the following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention its application or uses fig1 shows an ultrasonic resonator denoted overall with reference numeral 10 wherein in a converter 12 ultrasonic vibrations can be produced and the converter 12 transmits these vibrations via a first booster 14 and a second booster 16 to a sonotrode 18 the booster 16 and the sonotrode 18 can be configured as one piece it is also possible to configure the two boosters 14 and 16 and the sonotrode 18 as one component fig1 shows an ultrasonic resonator 10 which is disposed vertically and wherein the sonotrode 18 at the lower end thereof which is not shown has a working surface with which it rests against a workpiece 48 it is also conceivable however to provide a horizontal position of the sonotrode 18 so that the plane of the face has a vertical orientation furthermore it is possible to support the sonotrode 18 on both sides via bearing points 20 wherein its circumferential surface 22 represents the weld surface or working surface which is indicated with dash dotted lines in.