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A brazing process for turbine stator blades of a gas turbine

A brazing process and quiet technology, which is applied in the field of gas turbine turbine vane brazing process, can solve problems such as unqualified brazing, improve quality and service life, reduce the cost of brazing process, and reduce the probability of condensation cracks Effect

Active Publication Date: 2021-10-15
华瑞(江苏)燃机服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the purpose of the invention is to solve the deficiencies in the prior art, to provide a gas turbine turbine stator blade brazing process, to solve the large-area brazing area due to cooling and condensation to produce cracks and micro-cracks, resulting in unqualified brazing, In the case where rework is required for multiple brazing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] A gas turbine turbine vane brazing process comprises the following process steps:

[0028] a. Cleaning of cracks and cracks: cleaning the cracks and crack areas on the stator blades by mechanical grinding or ultrasonic pickling, the area after the grinding or pickling is the brazing area, wherein the specific process of mechanical grinding is: for For cracks with a depth of 0.5-1mm, use an abrasive belt machine to remove a thickness of 1.0mm from the surface as a whole, and the polished surface should have a smooth transition. For cracks with a depth of more than 1-2mm, use an alloy grinding head to grind and remove them separately; the ultrasonic acid 50g / mL citric acid is used for washing, the temperature is 65-85°C, and the ultrasonic pickling time is 12-17 minutes;

[0029] b. Area division: process multiple squares in the brazing area in step a; process the squares by argon arc welding, the specific method is as follows:

[0030] Argon arc welding is used in the b...

example 2

[0034] a. Cleaning of cracks and cracks: cleaning the cracks and crack areas on the stator blades by mechanical grinding or ultrasonic pickling, the area after the grinding or pickling is the brazing area, wherein the specific process of mechanical grinding is: for For cracks with a depth of 0.5-1mm, use an abrasive belt machine to remove a thickness of 1.0mm from the surface as a whole, and the polished surface should have a smooth transition. For cracks with a depth of more than 1-2mm, use an alloy grinding head to grind and remove them separately; the ultrasonic acid 50g / mL citric acid is used for washing, the temperature is 65-85°C, and the ultrasonic pickling time is 12-17 minutes;

[0035] b. Area division: process multiple squares in the brazing area in step a; it is formed by attaching a metal mesh, using a 10-20 mesh metal mesh, the specific method is as follows:

[0036] First use mechanical grinding to remove the overall depth of 0.5-1.5mm in the brazing area, and t...

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Abstract

The invention discloses a brazing process of a gas turbine turbine and flat vane. First, the cracks and cracks are cleaned, and the welding area is divided into multiple squares, and flux is applied, and a vacuum furnace is used for brazing. The application discloses a The gas turbine turbine and flat blade brazing process can effectively reduce the probability of condensation cracks in the brazing heat treatment process. Therefore, after multiple brazing heat treatments, elements such as silicon and boron in the brazing powder diffuse to the substrate, which will lead to toughness of the substrate. Reduced, the risk of shortened life due to mechanical strength degradation can be reduced to almost zero, so that the welded shape of the parts after vacuum furnace brazing is beautiful, smooth, and has few defects, and the number of re-brazing is greatly reduced to improve production efficiency.

Description

technical field [0001] The invention relates to the field of stator blade brazing, in particular to a gas turbine turbine stator blade brazing process. Background technique [0002] Brazing refers to a welding method in which the solder below the melting point of the weldment and the weldment are heated to the melting temperature of the solder at the same time, and the gap between the solid workpiece is filled with liquid solder to connect the metal; when brazing, the base metal must first be removed Oxide film and oil stains on the contact surface are used to facilitate the function of the capillary after the solder melts, increasing the wettability and capillary fluidity of the solder; according to the melting point of the solder, brazing is divided into hard brazing and soft soldering Welding; brazing deformation is small, the joint is smooth and beautiful, suitable for welding precision, complex and components composed of different materials, such as honeycomb structure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23P6/00
CPCB23K1/008B23K1/20B23P6/002
Inventor 李振
Owner 华瑞(江苏)燃机服务有限公司
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