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A brazing method for the end of a slender embedded casing pipe

An embedded, sleeved technology, applied in tubular articles, welding equipment, applications, etc., can solve problems such as the limitation of the amount of solder coating, the inability to guarantee the brazing gap, and the inability to guarantee the need for joint welding, etc. Avoid gap changes, ensure brazing quality, and ensure the effect of brazing gaps

Inactive Publication Date: 2016-07-06
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the brazing gap cannot be well guaranteed without considering the shape error of the pipe parts; the brazing length of this part is 7.5mm, which is an ultra-long joint. Influenced by the size of the solder tank, the amount of solder coating is limited
In summary, this brazing method cannot guarantee the welding needs of this joint, and needs to be improved

Method used

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  • A brazing method for the end of a slender embedded casing pipe
  • A brazing method for the end of a slender embedded casing pipe
  • A brazing method for the end of a slender embedded casing pipe

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a method for brazing the end of a slender and embedded casing pipe, which is characterized in that the brazing method for the end of a slender and embedded casing includes the following contents:

[0027] Guarantee measures for the brazing gap: The brazing method of the pipe end of the embedded casing pipe with a partially visible bellows is to control the processing size tolerance of a single part and design the expansion mold of the pipe end, as shown in the attached figure 1 After the mold is expanded, mechanical processing is carried out to ensure that the brazing gap between the bellows pipe end and the jacket is 0.06mm after the parts are combined and assembled; the parts are combined and assembled using a fixture to control the assembly size;

[0028] Brazing material selection and thermal cycle: local visible corrugated tube embedded casing pipe end brazing method, where the joint is welded with stainless steel materials and high-temperat...

Embodiment 2

[0041] This embodiment provides a method for brazing the end of a slender and embedded casing pipe, which is characterized in that the brazing method for the end of a slender and embedded casing includes the following content:

[0042] Guarantee measures for the brazing gap: The brazing method of the pipe end of the embedded casing pipe with a partially visible bellows is to control the processing size tolerance of a single part and design the expansion mold of the pipe end, as shown in the attached figure 1 After the mold is expanded, mechanical processing is carried out to ensure that the brazing gap between the bellows pipe end and the jacket is 0.08mm after the parts are combined and assembled; the parts are combined and assembled using a fixture to control the assembly size;

[0043] Brazing material selection and thermal cycle: local visible corrugated tube embedded casing pipe end brazing method, where the joint is welded with stainless steel materials and high-temperatu...

Embodiment 3

[0056] This embodiment provides a method for brazing the end of a slender and embedded casing pipe, which is characterized in that the brazing method for the end of a slender and embedded casing includes the following content:

[0057] Guarantee measures for the brazing gap: The brazing method of the pipe end of the embedded casing pipe with a partially visible bellows is to control the processing size tolerance of a single part and design the expansion mold of the pipe end, as shown in the attached figure 1 After the mold is expanded, mechanical processing is carried out to ensure that the brazing gap between the bellows pipe end and the jacket is 0.1mm after the parts are assembled; the parts are assembled using a fixture to control the assembly size;

[0058] Brazing material selection and thermal cycle: local visible corrugated tube embedded casing pipe end brazing method, where the joint is welded with stainless steel materials and high-temperature alloy materials, and the...

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Abstract

A pipe end brazing method of an elongated embedded sleeve comprises guarantee measures of a brazing gap, brazing filler metal selection and thermal cycle, design of a brazing filler metal coating scheme and process control of vacuum brazing. The guarantee measures of the brazing gap includes guaranteeing that the brazing gap between the pipe end of a bellows and an outer sleeve after part assembly is 0.06-0.1 mm and utilizing a fixture to control the assembly dimension in the part assembly; the brazing filler metal selection and thermal cycle includes controlling the diameter Phi of the paste AMS4786 brazing filler metal with a brazing filler metal proportion of 92%-94% to be 1.0-1.6 mm when presetting the paste AMS4786 brazing filler metal with the brazing filler metal proportion of 92%-94% before brazing, and presetting brazing foils with a thickness of 0.1mm; the design of the brazing filler metal coating scheme includes performing welding by presetting brazing filler metal at two ends, and presetting the paste AMS4786 brazing filler metal with a diameter Phi of 1.0-1.6 mm; the process control of vacuum brazing includes guaranteeing various sizes of the part after vacuum brazing through control of the in-furnace fixture. According to the pipe end brazing method of the elongated embedded sleeve, the brazing gap of the part can be guaranteed, full penetration welding of the pipe end can be achieved, and the brazing quality can be guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for brazing the ends of slender and embedded casing pipes. Background technique [0002] A critical step in the production of gas nozzle assemblies in gas turbine combustors. The nozzle assembly consists of three concentric tubes cantilevered from a centrally mounted side. Forming the passages for the mixed gas, purge air and atomizing air, the premix air swirler and plug injector are fixed along the length of the nozzle at the downstream end of the nozzle. A flexible metal bellows is located axially downstream of the premixer and vortexer along the intermediate pipe (diffuser). It is necessary to braze the intermediate pipe with the inner diameter of the plug injector once to complete the connection. The original brazing method of the components in this part is to set a pre-set solder tank on the inner diameter of the plug-type injector, do simple mechanical process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/20B23K1/203B23K2101/06
Inventor 孙丽燕赵宝群孔庆吉纪春雨张佳音
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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