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Turbine guider crake brazing repair method

A turbine guider and repair method technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of turbine guider crack repair and other problems, and achieve the effects of good bonding strength, improved life, and guaranteed safety

Inactive Publication Date: 2017-10-10
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for repairing the crack of the turbine guide by brazing to solve the technical problem of repairing the crack of the turbine guide

Method used

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  • Turbine guider crake brazing repair method
  • Turbine guider crake brazing repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Fluorescent inspection of cracks was carried out on an engine guider part to determine the location of the cracks, such as figure 1 , 2 shown. The magnification is 200 times and the base material is K416B. Grinding to remove cracks, set a groove with an angle of 90° and a depth of 0.8mm. Spread 300 meshes of 0.7mm thick nickel-based alloy powder FGH95 in the groove, and then spread 0.8mm thick mixed solder. The mixed solder includes nickel-based alloy powder FGH95 and solder BNi71CrSi, wherein FGH95 is 50% of the mass of the mixed solder.

[0049] The groove position is brazed at 1160°C, and the holding time is 10 minutes. After soldering, remove excess solder.

[0050] After the repair, the weld seam is dense and well combined with the matrix. After inspection by fluorescence and 20 times magnification, the inspection results are as follows: image 3 , 4 , 5 shown. image 3 It is a photo of the metallographic structure magnified 50 times. image 3 It can be se...

Embodiment 2

[0052] A certain engine guide part is subjected to crack fluorescence inspection, and the position of the crack is shown in Example 1. Its base material is K416B. Grinding to remove cracks, set the groove with an angle of 90° and a depth of 0.5mm. Lay 50 meshes of nickel-based alloy powder FGH95 with a thickness of 0.3 mm in the groove, and then pave a mixed solder with a thickness of 0.5 mm. The mixed solder includes nickel-based alloy powder FGH95 and solder BNi71CrSi, wherein FGH95 is 20% of the mass of the mixed solder.

[0053] The groove position is brazed at 1300°C, and the holding time is 8 minutes. After soldering, remove excess solder.

[0054] After the repair, the weld seam is dense and well combined with the matrix. After inspection by fluorescence and 20 times magnification, the inspection results are consistent with image 3 , 4 , 5 are similar, showing no crack defects. And after the repaired engine guide device has been used for more than 1000 times, the...

Embodiment 3

[0056] A certain engine guide part is subjected to crack fluorescence inspection, and the position of the crack is shown in Example 1. Its base material is K416B. Grinding to remove cracks, set a groove with an angle of 120° and a depth of 1.2 mm. Lay 200 meshes of nickel-based alloy powder FGH95 with a thickness of 0.9 mm in the groove, and then pave a mixed solder with a thickness of 1.5 mm. The mixed solder includes nickel-based alloy powder FGH95 and solder BNi71CrSi, wherein FGH95 is 60% of the mass of the mixed solder.

[0057] The groove position is brazed at 1000°C, and the holding time is 20 minutes. After soldering, remove excess solder.

[0058] After the repair, the weld seam is dense and well combined with the matrix. After inspection by fluorescence and 20 times magnification, the inspection results are as follows: image 3 , 4 , 5, showing no crack defects. And after the repaired engine guide device has been used for more than 1000 times, there is no crack...

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Abstract

The invention discloses a turbine guider crake brazing repair method. The method comprises the following steps that a crack of a turbine guider is removed, a groove is formed, and a bottom nickel-based alloy powder layer is laid in the groove; mixed brazing filler metal is arranged on the bottom nickel-based alloy powder layer, vacuum brazing is conducted, and the mixed brazing filler metal comprises 20-60% by mass of auxiliary nickel-based alloy powder and a brazing filler metal body; the bottom layer nickel-based alloy powder and the auxiliary nickel-based alloy powder are the same, and the difference between the melting point of the bottom layer nickel-based alloy powder and the auxiliary nickel-based alloy powder and the melting point of a substrate material of the turbine guider is + / -20 DEG C; and the temperature of brazing is higher than the melting temperature of the brazing filler metal body and is lower than the melting temperature of the bottom nickel-based alloy powder layer, the auxiliary nickel-based alloy powder and the substrate material. According to the turbine guider crake brazing repair method, the brazing filler metal body is completely melted, and the nickel-based alloy powder is not melted during brazing. The nickel-based alloy powder is mainly used as a structure frame, the brazing filler metal body is used for filling, and thus the stable structure and strength are ensured.

Description

technical field [0001] The invention relates to the field of repairing turbine guides, in particular to a method for repairing cracks in a turbine guide by brazing. Background technique [0002] At present, the crack repair technology of superalloy mainly adopts argon arc welding repair welding, but due to the large heat-affected zone during argon arc welding repair welding, it has a great influence on the part material, and the welding accessibility is poor. Turbine guider cracks generally appear at the root of the blade. If the affected area is large, it will have a greater impact on the performance of the blade. Therefore, argon arc welding cannot be used for repairing the turbine guider. Therefore urgently need to provide a kind of turbine guider crack repair method. Contents of the invention [0003] The invention provides a method for repairing the crack of the turbine guide by brazing to solve the technical problem of repairing the crack of the turbine guide. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/00
CPCB23K1/008B23K1/0008
Inventor 吕亮彭娜许小虎胡祥松易出山谢国宏尚延涛苗小锋伍根牛王院军
Owner CHINA HANGFA SOUTH IND CO LTD
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