FIELD: mechanical engineering; welding. SUBSTANCE: according to proposed method, blank and workpiece to which blank is to be welded is clamped between ring ultrasonic bracket and counter-stop, thus limiting vibrations caused by ultrasonics in central area of round blank. Prior to welding, central part of round blank is provided with embossment. EFFECT: no negative influence of ultrasonic vibrations onto central area of round blank and prevention of damages to blank. 4 cl, 10 dwg
