the present invention generally relates to a high - frequency pulse oscillator , and more particularly to a high - frequency pulse oscillator adapted to provide pulse currents having a high frequency and large amplitude so as to transition metallic materials into a plastic state for ease of processing or for closing microcracks formed in metallic parts in order to recover mechanical characteristics thereof . the high - frequency pulse oscillator of the present invention comprises a controllable rectifier , a switching section , and a control system . the controllable rectifier rectifies alternating currents supplied from a current source to output currents having a predetermined waveform , according to a control signal from the control system . the switching section generates pulse currents using the currents from the rectifier , according to another control signal from the control system . the switching section comprises at least one switching block , which is connected so that the amplitude of the pulse currents is increased . the control system controls the rectifier and the switching section according to the signals to start , stop , and reset the operation of generating the pulse currents and the signals to specify or change the frequency and amplitude of the pulse currents , so that the generated pulse currents may have desired frequency and amplitude . the pulse currents generated in the high - frequency pulse oscillator enable the manufacture of various structural parts without degrading their structure .