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Repairing method for defects of turbine guide blade

A technology for turbine guide vanes and defects, applied in welding media, welding/cutting media/materials, manufacturing tools, etc., can solve problems such as no improvement, unsuitable for repair, and non-compliance with technical standards

Active Publication Date: 2011-06-29
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fusion welding (argon arc welding) method was used to repair these defects. After the test, it was found that cracks occurred on the back of the weld and the heat-affected zone of the weld, which did not meet the requirements of the technical standard. Although various preventive measures were taken successively The technological measures for cracks were tested, but there was no improvement. The main reason is that the content of Al and Ti in K417G alloy is relatively high.
Therefore, the fusion welding method is not suitable for the repair of the defect of the K417G turbine guide vane

Method used

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  • Repairing method for defects of turbine guide blade
  • Repairing method for defects of turbine guide blade
  • Repairing method for defects of turbine guide blade

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for repairing defects of turbine guide vanes: filling defects to be repaired with paste-like mixed powder (a mixture of solder, alloy powder, and binder) and performing vacuum brazing to repair defects of K417G turbine guide vanes. The specific requirements are as follows

[0030] 1. Preparation before welding

[0031] 1.1 Defect cleaning: Use mechanical processing methods to completely remove oxide slag inclusions, holes, and non-linear looseness that do not meet the standard requirements of cast blades.

[0032] 1.2 X-ray inspection: Use X-ray to inspect the position of the defect that has been removed, and the defect should be completely removed after inspection.

[0033] 1.3 Clean up the oxide skin: use a grinder equipped with an alloy grinding head to clean the oxide skin on the defect surface and its surroundings, and it should show a metallic luster after removal.

[0034] 2. Cleaning: Clean the blades with acetone.

[0035] 3. Preset paste mixed powd...

Embodiment 2

[0053] The defects to be repaired are filled with paste alloy powder and vacuum brazing is used to repair the defects of K417G turbine guide vanes. The operation of repairing the blade in this embodiment is different from Embodiment 1 in two points:

[0054] One is that paste-like alloy powder is used to fill the defects to be repaired, and its proportion is 92% of FGH741 alloy powder and 8% of brazing binder; The thickness of the material is 1 / 2 to 3 / 4 of the defect depth.

[0055] The brazing quality of the repaired blades meets the standard requirements after inspection, and the shape, size and position accuracy meet the requirements of the design drawings.

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Abstract

The invention relates to a repairing method for defects of a turbine guide blade. The method comprises the following steps: filling the defects with paste alloy powder or paste mixed powder; then coating paste brazing filler metal around the filled defects; drying the filler; and carrying out the repairing operation: putting the blade in a vacuum furnace, and performing repairing and brazing by adopting the vacuum brazing technology. The repairing method for defects of the turbine guide blade provided by the invention effectively prevents flaws; the property of the brazing technology and the mechanical property of the repaired parts meet the requirements; the molded surface of the blade and the accuracy of all sizes and positions completely meet the requirements. Therefore, the passing rate of the cast blades is improved, the cost is reduced, and remarkable economic benefits are created.

Description

Technical field: [0001] The invention relates to the technical field of repairing casting defects and use defects of guide vanes in turbine manufacturing and maintenance technology, and in particular provides a method for repairing defects of turbine guide vanes. Background technique: [0002] In the prior art, the turbine guide vane (the turbine guide vane of the multi-connected structure cast with K417G nickel-based cast superalloy is example, see figure 1 ) Due to the complex structure of the blade, the casting process is difficult, and about 50% of the cast blades have defects such as oxide slag inclusions, holes, and nonlinear porosity that do not meet the requirements of relevant technical standards. According to standard requirements, these defects are allowed to be repaired by welding. The fusion welding (argon arc welding) method was used to repair these defects. After the test, it was found that cracks occurred on the back of the weld and the heat-affected zone of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K35/22
Inventor 孔庆吉宋文清曲伸杜静邵天巍彭志江潘新宇纪春雨张磊先
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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