Depending on the environmental conditions, transducers with protection levels IP50, IP65 and IP67 are available. For rotary applications, a family of transducers with integrated HF interface for rotary couplers has been developed. All transducers use the same core structure and are equipped with rugged four-piece piezoelectric ceramics. The rigid decoupling principle enables the welding head to withstand extremely high axial and lateral forces. The special manufacturing process further increases the service life of the welding head and always maintains a constant output amplitude.