FIELD: metal working by pulse pressure, possibly electrohydraulic expansion of tubes in tube plates of heat exchangers, sizing tubular blanks and vessels. SUBSTANCE: method comprises steps of using electric pulse charge created between high-voltage and ground electrodes arranged in water-filled tube; pressing in tube at applying to high-voltage electrode several pulses whose number at preset energy of unit pulse is determined according to given relation. It provides lowered energy level of unit pulse. EFFECT: lowered mass and dimension, simplified design of apparatus, enhanced quality of joints. 1 dwg, 1 ex, 1 tbl
