FIELD: technology for making differentiating markings of objects.
SUBSTANCE: for each zone on object electrode is positioned, electric-conductive working liquid is fed between electrode and given zone and electric pulse is generated between electrode and selected zone through working environment, with voltage and power, enough to provide for penetration of working liquid and local structural change of material in each selected zone, while differentiating marking of object is mutual positioning of zones with structural changing of material. To increase marking quality between electrode and selected zone alloying element is positioned.
EFFECT: when used for marking, for example, metallic pipes, produces stable marking with extensive lifetime.
2 cl, 8 dwg, 2 tbl
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