METHOD OF VACUUM MACHINING OF SURFACE OF PIPES AND GEAR FOR ITS REALIZATION Russian patent published in 2000 - IPC

FIELD: metallurgy, mechanical engineering, construction industry, oil and gas-producing industry, public utilities. SUBSTANCE: gear for realization of method has electrodes placed coaxially with reference to pipe and connected to power supply source, solenoids arranged in zone of electrodes, superimposed vacuum chamber that can be positioned over any section of pipe or in zone of welded joints, unit for deposition of protective coats located in vacuum chamber behind electrodes during operational process, unit for movement of electric arc electrodes, unit for deposition of protective coat and superimposed vacuum chamber. EFFECT: capability for deposition of coats on internal and external surfaces of pipes of large diameter in field, capability for local or uninterrupted machining and deposition of protective coats on pipes without their transfer into stationary vacuum chambers. 10 cl, 3 dwg