A method for anti-corrosion treatment of the last stage blade of a steam turbine

Abstract

The invention discloses an anti-corrosion treatment method for the last stage blade of a steam turbine, which belongs to the technical field of anti-corrosion of the last stage blade of a steam turbine. A method for anti-corrosion treatment of a final stage blade of a steam turbine of the present invention includes the following steps: step 1, processing a groove on the surface of the water-erodible area on the steam inlet side of the blade; step 2, adjusting the groove to be surfacing to a horizontal state; step 3. Preheat the groove to be surfacing; step 4, plan the welding path and compile the welding robot program for the groove to be surfacing, and set the arc starting position and arc ending position; step 5, find the coordinates of the workpiece, and run the automatic In the micro-arc plasma spray welding procedure, the Stellite alloy is automatically spray-welded on the groove to be surfacing; Step 6, post-heat the spray-welded seam; Step 7, perform stress relief heat treatment on the blade. The invention directly adopts automatic micro-arc plasma spray welding Stellite alloy in the water-erosion-prone region of the last stage blade of the steam turbine, and the treated blade has good corrosion resistance, small deformation and long service life.

Description

technical field [0001] The invention relates to an anti-corrosion treatment method for the last-stage blade of a steam turbine, and belongs to the technical field of anti-corrosion technology for the last-stage blade of the steam turbine. Background technique [0002] The last-stage blades of steam turbines serve in a wet steam environment. When the blades rotate at high speed, water erosion is very easy to occur on the steam inlet or outlet sides of the blades. At present, the anti-corrosion technologies of the last-stage blades at home and abroad mainly include brazing Stellite alloy sheets, Laser cladding, electric spark strengthening, thermal spraying, electron beam strengthening, plasma quenching, high-frequency induction hardening, laser quenching and other technologies, but the best anti-corrosion effect in actual operation is the Stellite alloy hardened layer, but the effect is the best at present. The best way is laser cladding Stellite alloy, but the cost of laser ...

AI Technical Summary

Problems solved by technology

[0002] The last-stage blades of steam turbines serve in a wet steam environment. When the blades rotate at high speed, water erosion is very easy to occur on the steam inlet or outlet sides of the blades. At present, the anti-corrosion technologies of the last-stage blades at home and abroad mainly include brazing Stellite alloy sheets, Laser cladding, electric spark strengthening, thermal spraying, electron beam strengthening, plasma quenching, high-frequency induction hardening, laser quenching and other technologies, but the best anti-corrosion effect in actual operation is the Stellite alloy hardened layer, but the effect is the best at present. The best way is laser cladding Stellite alloy, but the cost of laser cladding is high and the efficiency is low

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