A method of ultrasonic impact hardening of metal surfaces, wherein the ultrasonic transducer connected to the working tools are pressed normally to the surface of the product and moved relative to each other, processed by ultrasonic transducers placed along the line of movement given to the product and along its profile in the amount necessary to apply to a unit surface of the product a number of strokes specified by the technology, to the outlet ends of which the input ends of the working tools are pre-elastically pressed, and the impact force and clamping Surface treatment is performed in an inert gas environment of argon or helium and the gas is supplied by a jet directly to the treatment area.
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