FIELD: electricity.
SUBSTANCE: pulse discharge is created between an end surface of an electrode (37) and an end part of a metal plate (11), in order to cause the electrode (37) wear and form a groove (41) in its end surface, shape of which complies with the shape of the end part of the metal plate (11). The relative displacement of the electrode (37) is done in direction perpendicular to the side of the metal plate (11). A pulse discharge is created between the inner side surface of the groove (41) of the electrode (37) and the side surface (11b, 11c) of the end part of the metal plate (11), in order to create an auxiliary coating (43) or (45) at the side (11b, 11c) of the end part of the metal plate (11), and a pulse discharge is created between the lower surface of the groove (41) of the electrode (37) and the upper surface of the end part of the metal plate (11), in order to form a plating layer (47) on the end part of the metal plate (11).
EFFECT: improved strength characteristics of a surface layer.
2 cl, 6 dwg
