Abstract: An ultrasonic flow meter comprising two piezoelectric ultrasonic transducers each comprising a first and a second electrode; an ultrasonic flow meter housing, at least a part of which forms a support substrate for supporting the two piezoelectric ultrasonic transducers on an electrically conductive layer of the support substrate; an adhesive applied between the electrically conductive layer and the first electrode; wherein at least the first electrode of each piezoelectric ultrasonic transducer has a roughened surface, and wherein electrical connection between the electrically conductive layer and the first electrode is formed by said roughening.

Abstract: A method of bonding an electrode of a piezoelectric ultrasonic transducer to an electrically conductive layer of a support substrate, in order to support the piezoelectric ultrasonic transducer and establish an electrical connection between the electrode and the electrically conductive layer. The method includes: roughening the surface of one or both of the electrode and the electrically conductive layer; applying an adhesive to one or both of the electrode and the electrically conductive layer; assembling the electrode and the electrically conductive layer; and curing the adhesive. An assembly, an ultrasonic flow meter, and surface mount technology assembly is also disclosed.