FIELD: plastic metal working, possibly electrohydraulic pulse type expansion of tubes of heat exchange apparatuses, descaling tubes, sizing tubular blanks and vessels. SUBSTANCE: apparatus includes rod like high voltage electrode with hard insulation coating, grounded electrode in the form of one or several resilient wire pieces arranged in parallel relative to high voltage electrode. The last is mounted with possibility of lengthwise motion relative to grounded electrode. EFFECT: increased useful life period of apparatus. 2 dwg
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