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Method for repairing cracks in installing support of combustion box

A technology for mounting brackets and combustion chambers, applied in the field of repairs, can solve the problems of large welding deformation, complex design and manufacture of tooling, and low production efficiency, and achieve the effects of preventing oxidation, discoloration or burning, improving production efficiency, and reducing costs

Active Publication Date: 2014-02-19
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: by adjusting the influencing factors such as welding current and shielding gas flow rate, reasonable welding parameters are found out, the purpose of argon arc brazing in the air environment and without tool protection is realized, and the combustion chamber is solved. When repairing the brazing seam at the mounting bracket outside the case shell, the design and manufacture of the tooling is complicated, the welding deformation is large, and the technical problems of low production efficiency

Method used

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  • Method for repairing cracks in installing support of combustion box
  • Method for repairing cracks in installing support of combustion box

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The casing of an aero-engine combustor, after being used for a period of time, has cracks in the mounting bracket, which needs to be repaired, and it is required that there are no cracks and linear defects after the repair. The specific implementation steps are as follows:

[0023] 1) Pre-weld inspection: Fluorescence inspection is carried out on the casing to be repaired to determine the specific location of the crack defect at the bracket; the crack is located at the vacuum brazing seam connection between the mounting bracket and the casing main body. ;

[0024] 2) Mechanical cleaning: Use a wind grinding wheel to polish the cracks on the brazed welds at the mounting bracket, and wipe the polished area with a white Dacron cloth dipped in alcohol or acetone until the white cloth does not turn black;

[0025] 3) Ultrasonic cleaning: Ultrasonic cleaning is performed on the combustion chamber casing and brazing wire to be repaired until the dirt on the entire part and the...

Embodiment 2

[0030] Another kind of aero-engine combustor casing, after a period of use, the mounting bracket has cracks, and it is repaired, and it is required that there are no cracks and linear defects after the repair. The specific implementation steps are:

[0031] 1) Pre-weld inspection: Fluorescence inspection is carried out on the casing to be repaired to determine the specific location of the crack defect at the bracket; the crack is located at the vacuum brazing seam connection between the mounting bracket and the casing main body. ;

[0032] 2) Mechanical cleaning: Use a wind grinding wheel to polish the cracks on the brazed welds at the mounting bracket, and wipe the polished area with a white Dacron cloth dipped in alcohol or acetone until the white cloth does not turn black;

[0033] 3) Ultrasonic cleaning: Ultrasonic cleaning is performed on the combustion chamber casing and brazing wire to be repaired until the dirt on the entire part and the surface of the welding wire is ...

Embodiment 3

[0038] The third type is an aero-engine combustor casing. After a period of use, the mounting bracket produces cracks. Repair it, and require no cracks and linear defects after the repair. The specific implementation steps are:

[0039] 1) Pre-weld inspection: Fluorescence inspection is carried out on the casing to be repaired to determine the specific location of the crack defect at the bracket; the crack is located at the vacuum brazing seam connection between the mounting bracket and the casing main body. ;

[0040] 2) Mechanical cleaning: Use a wind grinding wheel to polish the cracks on the brazed welds at the mounting bracket, and wipe the polished area with a white Dacron cloth dipped in alcohol or acetone until the white cloth does not turn black;

[0041] 3) Ultrasonic cleaning: Ultrasonic cleaning is performed on the combustion chamber casing and brazing wire to be repaired until the dirt on the entire part and the surface of the welding wire is removed;

[0042] 4)...

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Abstract

The invention relates to a method for repairing cracks in an installing support of a combustion box. According to the method for repairing the cracks in the installing support of the combustion box, a base body is heated in an electric arc mode, a welding current is adjusted, the purpose of having control over the heat input quantity is achieved, namely, a parent material is prevented from melting, and can be fully heated, so that it is ensured that spreading wetting is fully carried out on a BNi-2 welding wire after the BNi-2 welding wire is melted, when welding is carried out, inert gas is fed into a welding zone, a weld surface is prevented from oxidation discoloration or burning loss, fluorescent inspection is carried out on the weld surface after welding is carried out, and the weld surface is free of the defects such as the cracks or air holes. A welding tool is omitted, production efficiency is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to a repair method, in particular to a repair method for cracks at the installation bracket of the casing of the combustion chamber. Background technique [0002] Some combustion chamber casings in aviation products are made of superalloy materials, and the mounting brackets outside the casing wall are connected by vacuum brazing. After a period of flight use, defects such as cracks often appear at the brazing seam. If the vacuum brazing method is used to repair the cracks at the welding seam, it is necessary to make complicated tooling according to the assembly structure of the combustion chamber casing, and the production cost is high and the efficiency is low. Moreover, during the second vacuum brazing, the brazing filler metal at the original welding seam may have flow problems, and the internal structure of the material may also have adverse effects, which does not meet the basic principles of welding repair. Argon-arc weld...

Claims

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Application Information

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IPC IPC(8): B23K1/00
CPCB23K1/00B23K1/206B23K9/16
Inventor 郑欣赵兴福陈健王广海兰宇梁福玉孙强
Owner HARBIN DONGAN ENGINE GRP
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