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Method for vacuum brazing of large-size outer ring welding assembly

A welding component and large-size technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems that cannot meet the research and trial production requirements of large-size outer ring welding components, and meet the vacuum brazing gap requirements and optimize the process Parameters, the effect of ensuring welding quality

Active Publication Date: 2021-06-15
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for vacuum brazing large-size outer ring welding components, which solves the problem that the existing vacuum brazing process cannot meet the research and trial production requirements of such large-size outer ring welding components

Method used

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  • Method for vacuum brazing of large-size outer ring welding assembly
  • Method for vacuum brazing of large-size outer ring welding assembly
  • Method for vacuum brazing of large-size outer ring welding assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The invention discloses a method for vacuum brazing a large-size martensitic stainless steel outer ring welding assembly, which specifically includes the following steps:

[0054] Step 1. Polishing: use a steel wire wheel to polish the portion to be welded of the annular honeycomb 2 on the surface of the outer ring substrate 1 until fresh metallic luster is exposed.

[0055] Step 2. Cleaning: Clean the surface of the part with clean acetone, and then dry the part. The surface of the cleaned part should be free of oil and other dirt.

[0056] Step 3. Extruding the solder: use a solder extruder to squeeze the strip-shaped solder into the cells of the annular honeycomb 2, and then scrape off excess solder on the surface of the annular honeycomb 2 until the metallic luster is exposed.

[0057] Step 4. Assembly and energy storage spot welding: pre-coat a ring of prepared solder paste on the outer ring base 1, put the ring-shaped honeycomb 2 pressed with solder into the outer...

Embodiment 2

[0070] The invention discloses a method for vacuum brazing a large-size martensitic stainless steel outer ring welding assembly, which specifically includes the following steps:

[0071] Step 1. Polishing: use a steel wire wheel to polish the portion to be welded of the annular honeycomb 2 on the surface of the outer ring substrate 1 until fresh metallic luster is exposed.

[0072] Step 2. Cleaning: Clean the surface of the part with clean acetone, and then dry the part. The surface of the cleaned part should be free of oil and other dirt.

[0073] Step 3. Extruding the solder: use a solder extruder to squeeze the strip-shaped solder into the cells of the annular honeycomb 2, and then scrape off excess solder on the surface of the annular honeycomb 2 until the metallic luster is exposed.

[0074] Step 4. Assembly and energy storage spot welding: pre-coat a ring of prepared solder paste on the outer ring base 1, put the ring-shaped honeycomb 2 pressed with solder into the outer...

Embodiment 3

[0087] The invention discloses a method for vacuum brazing a large-size martensitic stainless steel outer ring welding assembly, which specifically includes the following steps:

[0088] Step 1. Polishing: use a steel wire wheel to polish the portion to be welded of the annular honeycomb 2 on the surface of the outer ring substrate 1 until fresh metallic luster is exposed.

[0089] Step 2. Cleaning: Clean the surface of the part with clean acetone, and then dry the part. The surface of the cleaned part should be free of oil and other dirt.

[0090] Step 3. Extruding the solder: use a solder extruder to squeeze the strip-shaped solder into the cells of the annular honeycomb 2, and then scrape off excess solder on the surface of the annular honeycomb 2 until the metallic luster is exposed.

[0091] Step 4. Assembly and energy storage spot welding: pre-coat a ring of prepared solder paste on the outer ring base 1 . Put the ring-shaped honeycomb 2 pressed with solder into the out...

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Abstract

The invention relates to the technical field of welding, and discloses a method for vacuum brazing of a large-size outer ring welding assembly. The method comprises the steps that assembling and energy storage spot welding are conducted, wherein after a honeycomb is arranged on an outer ring base body, pre-positioning is firstly carried out, and then reinforced positioning is carried out; in the pre-positioning process, energy storage spot welding is conducted in a symmetrical positioning mode and a fractional positioning mode; and in the reinforced positioning process, energy storage spot welding is carried out in a layered positioning and staggered positioning mode. Through pre-positioning and reinforced positioning, it is guaranteed that the honeycomb is assembled and positioned firmly and reliably, the subsequent vacuum brazing gap requirement is met, and the honeycomb is not damaged; meanwhile, vacuum brazing process parameters are optimized, the heat preservation time at the stable temperature of 950 DEG C is prolonged to 40 min-50 min, the influence of the large-size effect of the outer ring base body is reduced, the temperature gradient is reduced, and the temperature of all parts of the outer ring base body is made to be uniform; and the vacuum brazing temperature is increased to 1045 DEG C, the brazing heat preservation time is prolonged to 10 min-20 min, the honeycomb brazing quality is guaranteed, and meanwhile base metal corrosion and honeycomb hole blocking are avoided.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for vacuum brazing a large-size outer ring welding assembly. Background technique [0002] Aeroengines and gas turbines are the country's most important weapons, and play a pivotal role in the fields of defense industries such as aviation, ships, and energy. As a honeycomb sealed part, the outer ring welded assembly is widely used in aero-engines and gas turbines. Usually, the outer ring welded assembly is composed of the outer ring matrix and the honeycomb, which are connected by a vacuum brazing process, and the maximum outer diameter is about 500mm. A new type of gas turbine outer ring welded assembly (such as figure 1 As shown) is composed of 1Cr11Ni2W2MoV outer ring matrix and GH536 honeycomb, the maximum outer diameter exceeds 1000mm, the perimeter of the honeycomb exceeds 3000mm, and the contact area between the honeycomb and the outer ring matrix exceeds 40000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/008
CPCB23K1/20B23K1/008
Inventor 王祥贺振宇张军张恒成斌王晨杨红茹童毓杰
Owner AECC AVIATION POWER CO LTD
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