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A method for a-tig welding repair of long cracks in the support plate of the rear casing of the aero-engine turbine

An aero-engine and repair method technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as decreased mechanical properties of welds, large welding residual stress, poor fusion of side walls, etc., and achieves the reduction of welding heat affected area. Small size, small weld cross-sectional area, and shortened maintenance cycle

Active Publication Date: 2022-03-11
PLA NO 5719 FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner ring is circular, and there are rectifying support plates outside the load-bearing support plate. Under the action of comprehensive stress such as vibration stress and thermal stress during work, a large number of long cracks appear at the welds between the support plate and the inner and outer rings and are scrapped. The repair method is TIG welding. Due to the large number and long cracks, the installation surface is seriously deformed after repair, and the runout of the end face is out of tolerance, resulting in repair failure.
[0003] Traditional TIG welding technology, in order to solve the problem of poor fusion of the side wall, it is necessary to open a V-shaped groove with a large angle, many welding passes, wide welding heat-affected zone, large welding residual stress, and large welding deformation
At the same time, due to the large welding heat input, the weld structure is coarse, which reduces the mechanical properties of the weld.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: a kind of long crack A-TIG repairing method of aero-engine turbine rear casing support plate, 3 support plates have cracks, and the crack length is respectively 10mm, 12mm, 12mm, and it comprises the following steps:

[0026] S1. Flux preparation: scrape off the coating on the outside of the Inconel718 electrode, and mix it with acetone evenly;

[0027] S2. Use a pneumatic grinding pen and a type A1.5 grinding head to grind along the direction of the crack to remove the scale and dirt inside the crack to form an "I"-shaped groove, clean it with acetone, and dry it naturally;

[0028] S3, the flux mixed with S1 is coated on the surface of the crack;

[0029] S4, argon arc welding at the place where S2 is coated with flux, the argon arc welding welding current is 3-A, the argon gas flow rate is 16 L / min on the front side and 12 L / min on the back side;

[0030] S5. The fitter grinds to make the transition between the weld seam and the substrate smooth;

...

Embodiment 2

[0033] Embodiment two: a kind of long crackle A-TIG repairing method of support plate of aero-engine turbine rear casing, 4 support plates have crack, and crack length is respectively 10mm, 11mm, 11mm, 13mm, and it comprises the following steps:

[0034] S1. Flux preparation: scrape off the coating on the outside of the Inconel718 electrode, and mix it evenly with absolute ethanol;

[0035] S2. Use a pneumatic grinding pen and a type A1.5 grinding head to grind along the direction of the crack to remove the scale and dirt inside the crack to form an "I"-shaped groove, clean it with acetone, and dry it naturally;

[0036] S3, the flux mixed with S1 is coated on the surface of the crack;

[0037] S4. Argon arc welding at the place where S2 is coated with flux, the welding current of argon arc welding is 25A, the flow rate of argon gas is 13 L / min on the front side, and 10 L / min on the back side;

[0038] S5. The fitter grinds to make the transition between the weld seam and the...

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Abstract

The invention relates to an A-TIG welding repair method for long cracks on the rear casing support plate of an aero-engine turbine, comprising the following steps: S1, grinding and cleaning; S2, flux coating cracks; S3, argon arc welding; S4, fitter grinding ; S5, stress relief heat treatment; S6, inspection. The invention proposes the idea of ​​active TIG welding (A-TIG) to repair the long cracks in the support plate of the rear casing of the aero-engine turbine, the heat input of the welded joint is low, the welding heat-affected area is reduced, the mechanical properties of the welded joint are improved, and the intermediary machine The box deformation is greatly reduced compared with the TIG welding method. It greatly reduces the engine maintenance cost and shortens the engine maintenance cycle.

Description

technical field [0001] The invention relates to the technical field of aero-engine maintenance, in particular to an A-TIG welding method for repairing long cracks in the back casing support plate of an aero-engine turbine. Background technique [0002] The aero-engine turbine rear casing is the main load-bearing part at the rear of the engine. Eight support plates are welded between the inner and outer rings of the rear casing to form a frame. The outer ring is polygonal and connected to the outer culvert load-bearing ring through eight tie rods. The inner ring is circular, and there are rectifying support plates outside the load-bearing support plate. Under the action of comprehensive stress such as vibration stress and thermal stress during work, a large number of long cracks appear at the welds between the support plate and the inner and outer rings and are scrapped. TIG welding is the preferred repair method. Due to the large number and long cracks, the installation surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/04B23K9/167B23K9/235
CPCB23P6/045B23K9/235B23K9/167
Inventor 刘瑞陈海生彭东段俊菲孙治国罗光荣
Owner PLA NO 5719 FACTORY
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