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Method of using vacuum electron beam to braze turbine blades and end closure of engine

A vacuum electron beam and turbine blade technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of long heating process, narrow space, and shortened service life of blades, so as to improve working life and energy utilization rate. High, processing efficiency improvement effect

Active Publication Date: 2010-11-24
BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the space at the end cover of the turbine blade is very narrow, the accessibility of cleaning tools is poor, and the oxide skin at the end cover is often thick, it is difficult to achieve effective removal by mechanical cleaning, and the welding requirements cannot be met; moreover, during the heating and brazing process , is to heat the non-brazed area and the brazed area of ​​the turbine blade as a whole, and the non-brazed area has also experienced a high temperature process, which reduces the performance of the material and reduces the service life of the blade
Moreover, the heating process is long and the energy utilization rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Welding FWP14 engine turbine working blade end cover.

[0012] 1. Use high-pressure water sandblasting technology to pre-weld the brazing area, the water pressure is 6MPa, select 200-250 mesh silicon carbide powder, after surface treatment, install the end cover at the top hole of the blade;

[0013] 2. Use acetone and other organic solvents to make powdery solder into a paste, and evenly spread it near the brazing seam joint, and put it in a vacuum studio with a vacuum degree greater than 10-2Pa;

[0014] 3. Adjust the working distance of the electron gun to 600-700mm, apply 60kV high voltage to the electron gun, and the current of the focusing coil of the electron gun is 800-1050mA. Turn on the electron beam scanning system, the scanning mode is circular, and the scanning frequency is 1000Hz; The area to be welded is scanned and the brazing area is heated;

[0015] 4. Use an infrared thermometer to detect the temperature of the heating area, increase the beam current...

Embodiment 2

[0017] Welding XXXX engine turbine working blade end cover.

[0018] (1) Use high-pressure water blasting technology to pre-weld the brazing area, the water pressure is 6MPa, select 200-250 mesh silicon carbide powder, after surface treatment, install the end cover at the top hole of the blade;

[0019] (2) Use organic solvents such as acetone to adjust the powdery solder into a paste, and evenly apply it near the brazing seam joint, and place it in a vacuum studio with a vacuum degree greater than 10-2Pa;

[0020] (3) Adjust the working distance of the electron gun to 600-700mm, apply 60kV high voltage to the electron gun, and the current of the focusing coil of the electron gun is 800-1050mA, turn on the electron beam scanning system, the scanning mode is circular, and the scanning frequency is 1000Hz; the number of scanning points is 50, Scan the area to be welded and heat the brazed area;

[0021] (4) Use an infrared thermometer to detect the temperature of the heating ar...

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PUM

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Abstract

The invention relates to a method of using vacuum electron beam to braze the turbine blades and end closure of an engine used for welding the blades and end closure of the turbine engine. The method comprises the following steps: adopting the high pressure liquid sandblast treatment technology to perform pre-welding treatment to a brazing area, uniformly coating solder at the solder joints; adjusting the work distance and focusing coil current of an electron gun to scan in a circular scanning manner; and heating the brazing area. The invention adopts the high pressure liquid sandblast treatment method to clean the area to be brazed of the turbine blades, thus effectively removing scale and foreign matter such as oil stains on the surface of the end closure; and high-energy-density electron beam is adopted to heat the part of the welded workpiece, thus effectively protecting the performance of the material of the non-brazing area, minimizing the influence of the heating process on the turbine blades and facilitating to increase the service life of the turbine blades; the time for completing one brazing process under heating is only more than ten minutes, thus multiplying the processing efficiency; and the energy utilization rate is extremely high.

Description

[0001] Technical field: The present invention relates to a method for brazing the turbine blade end cover of an engine using a vacuum electron beam for welding the blade end cover of a turbine engine. Background technique [0002] At present, the welding of the end cover of the engine turbine blade is connected by vacuum brazing. Due to the particularity of the vacuum brazing welding process, it is first necessary to mechanically clean the welding surface before welding, and then put it into a vacuum chamber for heating. ,welding. Since the space at the end cover of the turbine blade is very narrow, the accessibility of cleaning tools is poor, and the oxide skin at the end cover is often thick, it is difficult to achieve effective removal by mechanical cleaning, and the welding requirements cannot be met; moreover, during the heating and brazing process , is to heat the non-brazed area and the brazed area of ​​the turbine blade as a whole, and the non-brazed area has also expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/005B23K1/20
Inventor 刘昕李晋炜胡刚付钢
Owner BEIJING AERONAUTICAL MFG TECH RES INST