阅读说明：本技术 一种多腔道燃料喷嘴管的瞬时液相过度连接方法 (Transient liquid phase transition connection method for multi-cavity fuel nozzle pipe ) 是由 任耀文 刘洋 康路路 王程成 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种多腔道燃料喷嘴管的瞬时液相过度连接方法,包括如下操作：分别加工第一喷嘴管组件和第二喷嘴管组件,在第一喷嘴管组件和第二喷嘴管组件内加工多个相平行的腔道；将第一喷嘴管组件和第二喷嘴管组件清洗干净后,在第一喷嘴管组件和第二喷嘴管组件的待钎处点焊镍基中间层,然后将第一喷嘴管组件和第二喷嘴管组件的腔道对准,将第一喷嘴管组件和第二喷嘴管组件压紧装配成燃料喷嘴管组件；采用焊接工装将燃料喷嘴管组件压紧,然后将焊接工装与燃料喷嘴管组件置于真空钎焊炉中,进行瞬时液相扩散焊。本发明通过将燃料喷嘴管一分为二,分别加工成型,并通过TLP焊接形成多腔道燃料喷嘴管,保证了腔道内壁的粗糙度,缩短了加工周期。(The invention discloses a transient liquid phase transition connection method of a multi-channel fuel nozzle pipe, which comprises the following operations: respectively processing a first nozzle pipe assembly and a second nozzle pipe assembly, and processing a plurality of parallel cavity channels in the first nozzle pipe assembly and the second nozzle pipe assembly; cleaning the first nozzle pipe assembly and the second nozzle pipe assembly, spot-welding a nickel-based intermediate layer at the positions, to be brazed, of the first nozzle pipe assembly and the second nozzle pipe assembly, aligning the channels of the first nozzle pipe assembly and the second nozzle pipe assembly, and tightly pressing the first nozzle pipe assembly and the second nozzle pipe assembly to assemble a fuel nozzle pipe assembly; and (3) compressing the fuel nozzle pipe assembly by adopting a welding tool, then placing the welding tool and the fuel nozzle pipe assembly in a vacuum brazing furnace, and carrying out instantaneous liquid phase diffusion welding. According to the invention, the fuel nozzle pipe is divided into two parts which are respectively processed and molded, and the multi-cavity fuel nozzle pipe is formed by TLP welding, so that the roughness of the inner wall of the cavity is ensured, and the processing period is shortened.)

1. A method of transient liquid phase over-connection of multi-channel fuel nozzle tubes comprising the acts of:

(1) respectively processing a first nozzle pipe assembly and a second nozzle pipe assembly which are symmetrical, wherein the first nozzle pipe assembly and the second nozzle pipe assembly are both cylindrical members with one ends being bent pipes and the other ends being straight pipes; processing a plurality of parallel channels in the first nozzle pipe assembly and the second nozzle pipe assembly respectively, wherein the inner walls of the channels are formed by milling;

(2) cleaning the first nozzle pipe assembly and the second nozzle pipe assembly, spot-welding a nickel-based intermediate layer at the positions, to be brazed, of the first nozzle pipe assembly and the second nozzle pipe assembly, aligning the channels of the first nozzle pipe assembly and the second nozzle pipe assembly, and tightly pressing the first nozzle pipe assembly and the second nozzle pipe assembly to assemble a fuel nozzle pipe assembly;

(3) and (3) compressing the fuel nozzle pipe assembly by adopting a welding tool, then placing the welding tool and the fuel nozzle pipe assembly in a vacuum brazing furnace, and carrying out instantaneous liquid phase diffusion welding.

2. The method for transient liquid phase over-connection of multi-channel fuel nozzle tubes according to claim 1, wherein the step (1) comprises equally dividing the fuel nozzle tube into the first nozzle tube assembly and the second nozzle tube assembly by wire cutting; and respectively machining a plurality of parallel cavities in the first nozzle pipe assembly and the second nozzle pipe assembly by adopting milling.

3. The method of transient liquid phase over-connection of multi-channel fuel nozzle tubes of claim 2 wherein the number of channels fabricated in the first nozzle tube assembly and the second nozzle tube assembly is two, three or four.

4. The method for instantaneous liquid phase reconnection of multi-channel fuel nozzle tubes according to claim 1, wherein after the first nozzle tube assembly and the second nozzle tube assembly are cleaned by kerosene and alcohol in the step (2), a nickel-based intermediate layer is spot-welded to the portions to be brazed of the first nozzle tube assembly and the second nozzle tube assembly by stored energy welding, and the brazing filler metal has a thickness of 0.05 mm.

5. The method for transient liquid phase over-connection of multi-channel fuel nozzle tubes according to claim 1, wherein the welding tool in step (3) comprises a bottom plate arranged at the bottom of the fuel nozzle tube assembly and side plates arranged at two sides of the fuel nozzle tube assembly, an upper plate is arranged above the fuel nozzle tube assembly, and gaps are respectively reserved between the upper plate and the side plates and the fuel nozzle tube assembly; the upper plate is provided with a plurality of through holes for mounting screws, and the screws penetrate through the through holes and the end parts of the screws are abutted against the top of the fuel nozzle pipe assembly.

6. The method for transient liquid phase over-joining of multi-channel fuel nozzle tubes according to claim 1, wherein in step (3) the welding fixture and the fuel nozzle tube assembly are placed in a vacuum brazing furnace and transient liquid phase diffusion welding is performed according to the following parameters:

the cold state vacuum degree is 6-8 multiplied by 10^-3Pa, working vacuum degree of 3-5 × 10^-2Pa；

Heating to 850-950 ℃ at the speed of 300-360 ℃/h, and keeping for 1-2 h;

heating to 1140-1180 ℃ at the speed of 360-450 ℃/h, and keeping for 4-6 h;

after heating, the furnace is cooled to 400-500 ℃ along with the vacuum, and high-purity argon is filled into the furnace to ensure that the pressure in the furnace reachesTo 6 to 8 x 10⁴And (4) starting a fan after Pa, cooling to below 100 ℃, and discharging to obtain the fuel nozzle pipe.

7. The method of transient liquid phase over-connection of multi-channel fuel nozzle tubes of claim 5 wherein the integrity of the weld of the fuel nozzle tube is visually inspected after the welding is completed and pressure testing is performed separately on the inner channels of the fuel nozzle tube; the test medium of the pressure test is purified water, the pressure is 5MPa, and the time is 30 min.

Technical Field

The invention belongs to the technical field of aerospace precision manufacturing, and relates to a transient liquid phase transition connection method for a multi-cavity fuel nozzle pipe.

Background

The multi-cavity fuel nozzle pipe comprises a plurality of cavities, different media flow through each cavity, and the manufacturing requirement of the multi-cavity fuel nozzle pipe is that the roughness of the inner wall of each cavity is small, otherwise, flow resistance is formed, and the product performance is influenced. FIGS. 1 and 2 show a schematic representation of a multi-channel fuel nozzle tube, typically made of a wrought superalloy; usually, a multi-channel fuel nozzle pipe is prepared by casting, but the roughness of the inner wall of the multi-channel fuel nozzle pipe prepared by casting is not easy to guarantee, and a single piece needs to be opened independently during production, so that the period is long, and the cost is high.

Disclosure of Invention

The invention aims to provide a transient liquid phase transition connection method of a multi-cavity fuel nozzle pipe, which ensures the roughness of the inner wall of a cavity, reduces the processing difficulty and shortens the processing period.

The invention is realized by the following technical scheme:

a method of transient liquid phase over-connection of multi-channel fuel nozzle tubes comprising the acts of:

(1) respectively processing a first nozzle pipe assembly and a second nozzle pipe assembly which are symmetrical, wherein the first nozzle pipe assembly and the second nozzle pipe assembly are both cylindrical members with one ends being bent pipes and the other ends being straight pipes; processing a plurality of parallel channels in the first nozzle pipe assembly and the second nozzle pipe assembly respectively, wherein the inner walls of the channels are formed by milling;

(2) cleaning the first nozzle pipe assembly and the second nozzle pipe assembly, spot-welding a nickel-based intermediate layer at the positions, to be brazed, of the first nozzle pipe assembly and the second nozzle pipe assembly, aligning the channels of the first nozzle pipe assembly and the second nozzle pipe assembly, and tightly pressing the first nozzle pipe assembly and the second nozzle pipe assembly to assemble a fuel nozzle pipe assembly;

(3) and (3) compressing the fuel nozzle pipe assembly by adopting a welding tool, then placing the welding tool and the fuel nozzle pipe assembly in a vacuum brazing furnace, and carrying out instantaneous liquid phase diffusion welding.

Further, in the step (1), the fuel nozzle pipe is equally divided into a first nozzle pipe assembly and a second nozzle pipe assembly by adopting linear cutting; and respectively machining a plurality of parallel cavities in the first nozzle pipe assembly and the second nozzle pipe assembly by adopting milling.

Further, the number of channels processed in the first nozzle tube assembly and the second nozzle tube assembly is two, three or four.

Further, after the first nozzle pipe assembly and the second nozzle pipe assembly are cleaned by kerosene and alcohol in the step (2), a nickel-based intermediate layer is welded on the positions to be brazed of the first nozzle pipe assembly and the second nozzle pipe assembly by adopting energy storage welding, and the thickness of the nickel-based intermediate layer is 0.05 mm.

Further, the welding tool in the step (3) comprises a bottom plate arranged at the bottom of the fuel nozzle pipe assembly and side plates arranged at two sides of the fuel nozzle pipe assembly, an upper plate is arranged above the fuel nozzle pipe assembly, and gaps are respectively reserved between the upper plate and the side plates and the fuel nozzle pipe assembly; the upper plate is provided with a plurality of through holes for mounting screws, and the screws penetrate through the through holes and the end parts of the screws are abutted against the top of the fuel nozzle pipe assembly.

Further, in the step (3), the welding tool and the fuel nozzle pipe assembly are placed in a vacuum brazing furnace, and instantaneous liquid phase diffusion welding is carried out according to the following parameters:

the cold state vacuum degree is 6-8 multiplied by 10^-3Pa, working vacuum degree of 3-5 × 10^-2Pa；

Heating to 850-950 ℃ at the speed of 300-360 ℃/h, and keeping for 1-2 h;

heating to 1140-1180 ℃ at the speed of 360-450 ℃/h, and keeping for 4-6 h;

after heating, the furnace is cooled to 400-500 ℃ along with the vacuum, and high-purity argon is filled into the furnace to ensure that the pressure in the furnace reaches 6-8 multiplied by 10⁴And (4) starting a fan after Pa, cooling to below 100 ℃, and discharging to obtain the fuel nozzle pipe.

Further, visually inspecting the integrity of the welding seam of the fuel nozzle pipe after welding is finished, and respectively performing pressure tests on the inner cavity channel of the fuel nozzle pipe; the test medium of the pressure test is purified water, the pressure is 5MPa, and the time is 30 min.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention discloses a transient liquid phase excess connection method of a multi-channel fuel nozzle pipe, which is characterized in that the fuel nozzle pipe is divided into two parts, a first nozzle pipe assembly and a second nozzle pipe assembly which are symmetrical are respectively processed, the first nozzle pipe assembly and the second nozzle pipe assembly are respectively and independently formed by adopting a machining method, then a nickel-based interlayer is spot-welded at the positions to be brazed of the first nozzle pipe assembly and the second nozzle pipe assembly, the first nozzle pipe assembly and the second nozzle pipe assembly are assembled and fixed through a welding tool, and then the first nozzle pipe assembly and the second nozzle pipe assembly are welded into a whole by adopting a transient liquid phase diffusion welding (TLP) method.

Aiming at the welding difficulty of the fuel nozzle pipe, the invention comprises the following steps: one end of the fuel nozzle pipe is a bent pipe, the other end of the fuel nozzle pipe is a straight pipe, a plurality of cavities are formed in the fuel nozzle pipe, the roughness of the inner wall of the fuel nozzle pipe needs to be guaranteed during processing, and the fuel nozzle pipe is a thin-wall pipe fitting, so that the welding difficulty is very high; the fuel nozzle pipe is divided into two parts, the first nozzle pipe assembly and the second nozzle pipe assembly which are symmetrical are respectively processed, and a plurality of cavities are processed in the first nozzle pipe assembly and the second nozzle pipe assembly, so that the processing difficulty is reduced; and then spot welding a nickel-based interlayer at the positions to be brazed of the first nozzle tube assembly and the second nozzle tube assembly, and welding the first nozzle tube assembly and the second nozzle tube assembly into a whole by using a transient liquid phase diffusion welding (TLP) method. The tensile strength of the joint at room temperature can reach 90% of that of the parent metal in the TLP welding process by using the nickel-based intermediate layer, the tensile strength at high temperature can reach 85% of that of the parent metal, and the working condition requirement can be completely met; in addition, liquid phase formed in the TLP welding process is little, and cannot enter the cavity channel of the fuel nozzle pipe, so that the roughness of the inner wall of the cavity channel is not influenced. The manufacturing method of the multi-cavity fuel nozzle pipe adopts TLP welding to realize the manufacturing of the multi-cavity fuel nozzle pipe, ensures the roughness of the inner wall of the cavity, shortens the processing period, and ensures that the welding seam of the manufactured fuel nozzle pipe does not leak or cross the cavity under the pressure test, thereby having good product performance and reliable quality.

Drawings

FIG. 1 is a schematic view of a multi-channel fuel nozzle tube configuration of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1 of the present invention;

FIG. 3 is a schematic structural view of a first nozzle tube assembly of the present invention;

FIG. 4 is a cross-sectional view of a first nozzle tube assembly of the present invention;

FIG. 5 is a schematic structural view of a second nozzle tube assembly of the present invention;

FIG. 6 is a cross-sectional view of a second nozzle tube assembly of the present invention;

FIG. 7 is a schematic view of the assembly of the first and second nozzle tube assemblies of the present invention;

FIG. 8 is a schematic view of the assembly of the welding fixture of the present invention with a fuel nozzle tube assembly;

the fuel nozzle pipe assembly comprises a fuel nozzle pipe assembly, a fuel nozzle pipe assembly and a fuel nozzle pipe assembly, wherein the fuel nozzle pipe assembly comprises a fuel nozzle pipe assembly, a fuel nozzle pipe assembly and a fuel nozzle pipe assembly, and is characterized in that 1 is an A cavity channel, 2 is a B cavity channel, 3 is a first nozzle pipe assembly, 4 is a second nozzle pipe assembly, 5 is a nickel-based intermediate layer, 6 is a bottom plate, 7 is a side plate, 8 is an upper plate, 9 is a screw, and 10 is the fuel nozzle pipe assembly.

Detailed Description

The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.

Referring to fig. 3 to 8, a transient liquid phase transition method of a multi-channel fuel nozzle tube includes the following operations:

(1) respectively processing a first nozzle pipe component 3 and a second nozzle pipe component 4 which are symmetrical, wherein the first nozzle pipe component 3 and the second nozzle pipe component 4 are both cylindrical components with one ends being bent pipes and one ends being straight pipes; a plurality of parallel channels are respectively processed in the first nozzle pipe component 3 and the second nozzle pipe component 4, and the inner walls of the channels are formed by milling;

(2) after cleaning the first nozzle tube assembly 3 and the second nozzle tube assembly 4, spot welding a nickel-based intermediate layer 5 at the positions of the first nozzle tube assembly 3 and the second nozzle tube assembly 4 to be brazed, aligning the channels of the first nozzle tube assembly 3 and the second nozzle tube assembly 4, and press-fitting the first nozzle tube assembly 3 and the second nozzle tube assembly 4 into a fuel nozzle tube assembly 10;

(3) and (3) compressing the fuel nozzle pipe assembly 10 by adopting a welding tool, then placing the welding tool and the fuel nozzle pipe assembly 10 in a vacuum brazing furnace, and carrying out instantaneous liquid phase diffusion welding.

Transient liquid phase diffusion bonding (TLP) is a physical contact in which joined surfaces are brought into contact with each other at a temperature and pressure, and the joined surfaces are expanded by local microscopic plastic deformation or by microscopic liquid phase generated by the joined surfaces; and then the bonding layer atoms are mutually dispersed for a certain time to form the process of integrally and reliably connecting. Transient liquid phase diffusion welding (TLP) generally adopts a material with a melting point lower than that of a parent material as an intermediate layer, when the TLP is heated to a connecting temperature, the intermediate layer is melted, an instant liquid film is formed on a joint surface, the thickness of the liquid film is reduced to disappear along with the diffusion of a low-melting-point component to the parent material in the heat preservation process, and the components are homogenized through heat preservation for a certain time.

Referring to FIGS. 1 and 2, a schematic illustration of a multi-channel fuel nozzle tube is shown; the multi-cavity fuel nozzle pipe is a double-cavity fuel nozzle pipe and comprises a cavity A1 and a cavity B2, different media flow through the cavity A1 and the cavity B2, and the roughness of the inner wall of the cavity is small when the manufacturing is required, otherwise, flow resistance is formed, and the performance of a product is influenced. The invention provides a transient liquid phase transition connection method of a multi-cavity fuel nozzle pipe aiming at the defects of long processing period and high cost of the multi-cavity fuel nozzle pipe, the fuel nozzle pipe is divided into two parts, the fuel nozzle pipe is cut into a first nozzle pipe component 3 and a second nozzle pipe component 4 by adopting a linear cutting method, the first nozzle pipe component 3 and the second nozzle pipe component 4 are separately formed by adopting a machining method, then a nickel-based intermediate layer 5 is spot-welded at the positions to be brazed of the first nozzle pipe component 3 and the second nozzle pipe component 4, and the nickel-based intermediate layer 5 consists of nickel-based brazing filler metal and forms a nickel-based amorphous intermediate layer; after the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are assembled and fixed through a welding tool, the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are welded through a TLP method, the nickel-based middle layer 5 is melted when the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are heated to a connecting temperature, instant liquid films are formed on the joint surfaces of the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4, the thickness of the liquid films is reduced to disappear along with the diffusion of low-melting-point components to the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 respectively in the heat preservation process, and the components are homogenized through heat preservation for a certain time; the fuel nozzle pipe prepared by the method has good performance, the roughness of the inner wall of the cavity can be ensured, the processing difficulty is reduced, and the processing period is shortened. The invention is not only suitable for manufacturing the double-channel fuel nozzle pipe, but also suitable for manufacturing the multi-channel fuel nozzle pipe, and the manufactured multi-channel fuel nozzle pipe has good performance and reliable quality.

Referring to fig. 3 and 4, a first nozzle tube assembly of the present invention is schematically illustrated; referring to fig. 5 and 6, a second nozzle tube assembly 4 of the present invention is shown in schematic structural form; further, in the step (1), the fuel nozzle pipe is equally divided into a first nozzle pipe assembly 3 and a second nozzle pipe assembly 4 by adopting linear cutting; respectively machining a plurality of parallel cavity channels in the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 by milling, namely respectively machining a cavity channel A1 and a cavity channel B2 which are parallel in the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 by milling; after the first nozzle tube assembly 3 and the second nozzle tube assembly 4 are respectively formed, the channel a 1 and the channel B2 in the first nozzle tube assembly 3 and the second nozzle tube assembly 4 are aligned, and the first nozzle tube assembly 3 and the second nozzle tube assembly 4 are assembled into the fuel nozzle tube assembly 10 in a pressing mode.

Further, the number of channels processed in the first nozzle tube assembly 3 and the second nozzle tube assembly 4 is two, three, or four. The invention is not only suitable for preparing the double-cavity fuel nozzle pipe, but also suitable for preparing the three-cavity or four-cavity fuel nozzle pipe. Because one end of the fuel nozzle pipe is a bent pipe and the other end of the fuel nozzle pipe is a straight pipe, when a plurality of cavities are arranged in the fuel nozzle pipe, the roughness of the inner wall of the fuel nozzle pipe is ensured at the same time when the fuel nozzle pipe is processed, and meanwhile, the fuel nozzle pipe is a thin-wall pipe, so that the welding difficulty is very high; according to the invention, the fuel nozzle pipe is divided into two parts, namely the first nozzle pipe component 3 and the second nozzle pipe component 4 which are symmetrical are respectively processed, and a plurality of channels are processed in the first nozzle pipe component 3 and the second nozzle pipe component 4, so that the processing difficulty of the multi-channel fuel nozzle pipe is greatly reduced.

Referring to fig. 7, there is shown a schematic view of the assembly of the first and second nozzle tube assemblies of the present invention; further, after the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are cleaned by kerosene and alcohol in the step (2), a nickel-based intermediate layer 5 is welded on the positions, to be brazed, of the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 by energy storage welding, and the thickness of the nickel-based intermediate layer 5 is 0.05 mm.

Referring to fig. 8, an assembly diagram of the welding fixture and the fuel nozzle tube assembly of the present invention is shown; further, the welding tool in the step (3) comprises a bottom plate 6 arranged at the bottom of the fuel nozzle tube assembly 10 and side plates 7 arranged at two sides of the fuel nozzle tube assembly 10, an upper plate 8 is arranged above the fuel nozzle tube assembly 10, and gaps are respectively reserved between the upper plate 8 and the side plates 7 and the fuel nozzle tube assembly 10; a plurality of through holes for mounting the screws 9 are formed in the upper plate 8, and the screws 9 penetrate through the through holes and the end parts of the screws are abutted against the top of the fuel nozzle pipe assembly 10.

Further, in the step (3), the welding tool and the fuel nozzle pipe assembly 10 are placed in a vacuum brazing furnace, and instantaneous liquid phase diffusion welding is performed according to the following parameters:

the cold state vacuum degree is 6-8 multiplied by 10^-3Pa, working vacuum degree of 3-5 × 10^-2Pa；

Heating to 850-950 ℃ at the speed of 300-360 ℃/h, and keeping for 1-2 h;

heating to 1140-1180 ℃ at the speed of 360-450 ℃/h, and keeping for 4-6 h;

after heating, the furnace is cooled to 400-500 ℃ along with the vacuum, and high-purity argon is filled into the furnace to ensure that the pressure in the furnace reaches 6-8 multiplied by 10⁴And (4) starting a fan after Pa, cooling to below 100 ℃, and discharging to obtain the fuel nozzle pipe.

It should be particularly noted that, in the invention, the nickel-based intermediate layer 5 is used, under the process parameters of the invention, the tensile strength of the TLP joint at room temperature reaches 90% of the strength of the parent metal, and the tensile strength at high temperature reaches 85% of the strength of the parent metal, so that the requirements of the working conditions can be met; in addition, a liquid phase formed in the TLP process is little, cannot enter the cavity, and has no influence on the roughness of the inner wall of the cavity; moreover, the TLP diffusion temperature is selected to be carried out at the base material solid solution temperature, so that the method is compatible with the heat treatment system of the base material and does not lose the base material performance.

Further, visually inspecting the integrity of the welding seam of the fuel nozzle pipe after welding is finished, and respectively performing pressure tests on the inner cavity channel of the fuel nozzle pipe; the test medium of the pressure test is pure water, the pressure is 5MPa, the time is 30min, and the welding seam is required not to leak and not to cross the cavity; and after the welding seam is inspected to be qualified, performing finish machining on the fuel nozzle pipe to enable the fuel nozzle pipe to reach the design size.

According to the technical scheme, the transient liquid phase excessive connection method of the multi-channel fuel nozzle pipe is characterized in that the fuel nozzle pipe is divided into two parts, the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 which are symmetrical are respectively machined, the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are respectively and independently formed by adopting a machining method, then a nickel-based interlayer is spot-welded at the positions to be brazed of the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4, the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are assembled and fixed through a welding tool, and then the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4 are welded into a whole by adopting a transient liquid phase diffusion welding (TLP) method.

Aiming at the welding difficulty of the fuel nozzle pipe, the invention comprises the following steps: one end of the fuel nozzle pipe is a bent pipe, the other end of the fuel nozzle pipe is a straight pipe, a plurality of cavities are formed in the fuel nozzle pipe, the roughness of the inner wall of the fuel nozzle pipe needs to be guaranteed during processing, and the fuel nozzle pipe is a thin-wall pipe fitting, so that the welding difficulty is very high; the fuel nozzle pipe is divided into two parts, the first nozzle pipe assembly 3 and the second nozzle pipe assembly 3 which are symmetrical are respectively processed, and a plurality of cavity channels are processed in the first nozzle pipe assembly 3 and the second nozzle pipe assembly 4, so that the processing difficulty is reduced; then, a nickel-based intermediate layer is spot-welded to the portions to be brazed of the first nozzle tube assembly 3 and the second nozzle tube assembly 4, and the first nozzle tube assembly 3 and the second nozzle tube assembly 4 are integrally welded by transient liquid phase diffusion welding (TLP). The tensile strength of the joint at room temperature can reach 90% of that of the parent metal in the TLP welding process by using the nickel-based intermediate layer, the tensile strength at high temperature can reach 85% of that of the parent metal, and the working condition requirement can be completely met; in addition, liquid phase formed in the TLP welding process is little, and cannot enter the cavity channel of the fuel nozzle pipe, so that the roughness of the inner wall of the cavity channel is not influenced. The manufacturing method of the multi-cavity fuel nozzle pipe adopts TLP welding to realize the manufacturing of the multi-cavity fuel nozzle pipe, ensures the roughness of the inner wall of the cavity, shortens the processing period, and ensures that the welding seam of the manufactured fuel nozzle pipe does not leak or cross the cavity under the pressure test, thereby having good product performance and reliable quality.

The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.