Transducers that meet protection IP50, IP65 and IP67 are available according to environmental conditions. In order to realize rotary application, a series of transducer with integrated rotary coupler HF interface has been developed. All transducers have the same core structure and are equipped with strong four-piece piezoelectric ceramics. The rigid decoupling principle allows the welding head to withstand high axial and transverse forces. Special manufacturing process makes the service life of the welding head further increased, and always maintain a constant output amplitude.