METHOD OF REPAIRING A COOLED BLADE FROM A HEAT-RESISTANT SUPERALLOY OF A TURBINE OF A GAS TURBINE ENGINE Russian patent published in 2019 - IPC B23P6/00 B23K26/146 C23C4/12 

FIELD: machine building.

SUBSTANCE: invention relates to repair of cooled blades from heat-resistant superalloy of gas-turbine engine turbine. Method involves preliminary removal of heat-shielding coating from blade surface of blade, cleaning end face of well of blade body from running-in tracks, cleaning outer and inner surfaces of the walls of the shaft of the blade of the blade, installation and fixation of the blade in the device, supply of a stream of metal powder coaxially to the laser beam, the chemical composition of which coincides with the material of the blade, surfacing of the end face of the blade body in a protective gas medium, heat treatment in a vacuum and control. Welding of metal powder is performed by laser beam in pulse mode with amplitude modulation of pulse, wherein each modulated pulse of laser beam consists of leading edge of pulse with power density for surfacing and trailing edge of pulse with power density for concomitant heating of surfacing zone at temperature equal to 0.7÷0.8 of melting point of heat resistant superalloy of blade. During surfacing, ratio of laser beam spot diameter to fusing surface width is provided 0.5…0.7. Besides, heat-resistant superalloy of cooled blade is alloy ZhS32-VI, for welding there used is metal powder from heat-resistant superalloy ZhS32-VI with fraction of 40–80 mcm, protection of deposition zone is performed locally with consumption of protective gas of 6–7 l/min.

EFFECT: method of repair provides higher quality of repair of blades from superalloy and eliminates formation of cracks in laser pulse surfacing.

4 cl, 5 dwg