Abstract: The method consists in generating periodically shock waves by initiating the electric discharge in a fluid filling in the well between the electrodes. To initiate the electric discharge, a current-conducting fluid comprising a dielectric fluid and a current-conducting powder material is fed additionally between the electrodes. The device for carrying the method into effect comprises a discharge chamber (5) with positive and negative a system of feeding an initials between the electrodes (3, 4), a system of feeding an initiator between the electrodes (3, 4), electrodes (3, 4), and a surge current generator (2). The device has at least one metering valve (12) with a drive (13) and an additional chamber (9) filled in with a dielectric fluid. A duct (10) having a pressure spool valve (11) is provided in the wall of the additional chamber (9). Inlet and outlet holes (7, 6) are provided in the wall of the discharge chamber (5).

Abstract: The invention relates to a method and apparatus for obtaining an ingot wherein elastic oscillations are directed on metal being crystallized over a broad frequency range and at high intensity in the form of powerful pulses generated by a high-voltage spark discharge in liquid. One form of the apparatus of the invention comprises a discharge chamber filled with liquid in contact with a mould or with melt. The discharge chamber is provided with a system of electrodes connected to a pulse current generator. Upon feeding high-voltage current pulses to the electrodes, high pressure, impulse flows, cavitation and surge waves are built-up in the liquid resulting in the appearance of elastic oscillations acting on the molten metal.