Manufacture of high frequency horns

Abstract From the Canadian patent

A horn for coupling high frequency vibrations from an electroacoustic converter, unit to a workpiece, such as is used for welding thermoplastic workpieces by ultrasonic vibrations, is constructed by machining sections of the horn and welding, the sections together using electron beam welding or laser beam welding. The respective sections can be made from bar or plate stock. This construction eliminates the machining of deep inaccessible slots, and as, most of the surfaces to be machined are accessible a fine surface finish can , be, provided thus eliminating tool marks which cause the existence of areas of high, mechanical stress concentrations when the horn is rendered resonant. Also …