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A method of laser cladding and anti-corrosion for steam turbine blades

A technology of steam turbine blades and laser cladding, which is applied in the coating process of metal materials, coatings, etc., can solve the problems of not meeting the requirements of water erosion resistance of blades, the production quality not meeting the requirements of use, and low production efficiency of blades

Active Publication Date: 2016-03-30
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of using laser cladding Stellite alloy for the anti-corrosion treatment of the inlet edge of steam turbine blades often has the problem of large deformation of the blades after laser cladding, and usually requires a large number of blade shaping treatments after laser cladding, so that the blades The production efficiency is low, and the production quality cannot meet the requirements of use; in addition, in the actual use process, different parts of the blades have different requirements for anti-corrosion, such as a Chinese invention patent application with the publication number CN103233222A. The laser cladding method on the air edge surface cannot meet the water erosion resistance requirements of different parts of the blade

Method used

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  • A method of laser cladding and anti-corrosion for steam turbine blades
  • A method of laser cladding and anti-corrosion for steam turbine blades
  • A method of laser cladding and anti-corrosion for steam turbine blades

Examples

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Effect test

Embodiment 1

[0044] A 40-inch steam turbine final stage blade, its material is 0Cr17Ni4Cu4Nb, the laser cladding process is as follows, firstly, the cladding groove is polished with a grinding wheel, the blade is clamped to the cladding machine, and then a preheater is installed to complete the cladding The area is preheated, the preheating temperature is 100°C, the laser power is set to 2500W, the defocus is adjusted to a spot size of 5mm, and the powder feeding amount is set to 5g / min; The angle α between the directions of the laser beams is 55°, and the points are taught along the lower edge of the cladding tank, the data is collected to the software, the speed of the X-axis (blade radial direction) is set to 80mm / min, and the Y-axis ( Blade lateral) offset of 2.5mm (intake side direction), the software generates a cladding path program along the groove edge line Y direction offset 2.5mm, cladding, after the first pass cladding is completed, the next pass The edge line is used as the re...

Embodiment 2

[0047] A 67-inch steam turbine final-stage blade, whose cladding length and width are larger than the 40-inch blade in Example 1. The laser cladding process is as follows. Firstly, the cladding groove is ground with a grinding wheel, the blade is clamped to the cladding machine, and then a preheater is installed to preheat the cladding area. The preheating temperature is 300°C, and the laser power Set it to 3800W, adjust the defocus amount until the spot size is 6mm, and set the powder feeding amount to 6.5g / min. Then rotate the blade until the angle α between the reference plane of the inner arc of the blade and the direction of the laser beam is 35°, carry out teaching and tracing along the lower edge line of the cladding tank, collect the data to the software, and set the X-axis (blade radial) speed to 90mm / min, set the Y-axis (blade transverse) offset to 3mm (intake edge direction), and generate a cladding path program along the groove edge line Y-direction offset of 3mm b...

Embodiment 3

[0050] A 48-inch steam turbine final stage blade, its material is 1Cr12Ni3Mo2VN, the laser cladding process is as follows, firstly, the cladding groove is polished with a grinding wheel, the blade is clamped to the cladding machine, and then a preheater is installed to complete the cladding The area is preheated, the preheating temperature is 200°C, the laser power is set to 3000W, the defocus is adjusted to a spot size of 5.5mm, and the powder feeding volume is set to 5.75g / min. Then rotate the blade until the angle α between the reference plane of the inner arc of the blade and the direction of the laser beam is 45°, carry out teaching and tracing along the lower edge line of the cladding tank, collect the data to the software, and set the X-axis (blade radial) speed to 85mm / min, set the Y-axis (blade transverse) offset to 2.5mm (intake edge direction), and generate a cladding path program along the groove edge line Y-direction offset of 2.5mm by the software for cladding, th...

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Abstract

The invention provides a water-erosion preventing method for a turbine blade by laser cladding. By adoption of the water-erosion preventing method, the laser cladding quality can be effectively ensured, the deformation of the laser-cladded blade can be reduced, and the requirement of different parts of the blade for the water erosion resistance can be ensured, so that the service life of the blade is prolonged. The water-erosion preventing method is characterized by comprising the following steps of: firstly carrying out roughening treatment on the surface of a blade cladding groove, then clamping the blade to a laser cladding machine tool, adopting a preheater to preheat the cladded areas of the blade, feeding powder by a side-shaft powder feeding head, and using a CO2 laser to clad stellite alloy powder in the blade cladding groove along the direction from the root of the turbine blade to the top of the turbine blade according to a mode of multilayered and multi-pass lapped cladding.

Description

technical field [0001] The invention relates to the field of processing and production of steam turbine blades, in particular to the technical field of anti-corrosion treatment of steam turbine blades, in particular to a method for laser cladding and anti-corrosion of steam turbine blades. Background technique [0002] Laser cladding Stellite alloy is currently a relatively new technology for strengthening the anti-corrosion surface of steam turbine blades. This technology uses laser to melt Stellite alloy powder and rapidly cools it to form a metallurgical bond with the blade matrix. It uses Stellite alloy The high hardness and high wear resistance of the blade improve the water erosion resistance of the blade, which is higher than the traditional brazing bonding strength, and can be directly repaired on the steam turbine. However, the current method of using laser cladding Stellite alloy for the anti-corrosion treatment of the inlet edge of steam turbine blades often has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 张铁磊滕树新刘伟伟王烜烽
Owner WUXI TURBINE BLADE
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