PROCEDURE FOR ELECTROSLAG COATING BUILD-UP ON INTERNAL SURFACE OF PIPE Russian patent published in 2015 - IPC B23K25/00 B23K101/06 

FIELD: metallurgy.

SUBSTANCE: strip electrode is fed, it is moved along pipe, and is melted with forming of liquid metal bath. Liquid metal bath is subjected to permanent magnetic field created by two solenoid coil with cores making opposite poles at edges of the strip electrode. Build-up is performed with pipe rotation and with electrode axial movement with core ends location in plane parallel to plane of the strip electrode, at both sides of its side edges. Build-up of the first ring bead is performed at similar supply currents of the solenoid coils. Build-up of the second and next beads is performed at increased by 1.3-3 current of the solenoid coil with core creating "north pole" at edge of the strip electrode at side of the previously build-up metal bead.

EFFECT: invention reduces difference of thicknesses of the build-up coating and its discontinuity as per chemical and phase composition.

3 cl, 2 dwg