Overall welding method of complex rectangular spraying pipe

Abstract

The invention discloses an overall welding method of a complex rectangular spraying pipe. The overall welding method comprises the following steps that according to the design requirement of the complex rectangular spraying pipe to be machined, four components of the spraying pipe are manufactured respectively and then subjected to vacuum brazing; the four components comprise a left side assembly,a right side assembly, an upper portion assembly and a lower portion assembly, wherein the left side assembly and the right side assembly are symmetrical, and the upper portion assembly and the lowerportion assembly are symmetrical; foil-like brazing filler metal is overspread on a first stainless steel base plate, one face, provided with a cooling channel, of a first copper plate faces the foil-like brazing filler metal, and after a tool carries out pressing, vacuum brazing is carried out to obtain the left side assembly and the right side assembly; a cambered surface of a second stainlesssteel base plate is a combination face, the foil-like brazing filler metal is overspread on the cambered surface, then the attachment cambered surface of the second copper plate faces the foil-like brazing filler metal, and after the tool carries out pressing, vacuum brazing is carried out to obtain the upper portion assembly and the lower portion assembly; and all the components are assembled into a rectangular structure, paste-like brazing filler metal is laid on connecting seams, and after pressing, vacuum brazing is carried out to obtain the rectangular spraying pipe overall assembly. According to the method, the parts are machined and subjected to brazing firstly, then overall brazing is carried out, and therefore the machining difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of aerospace equipment and relates to an integral welding method for complex rectangular nozzles. Background technique [0002] The divergence-convergence structure of the nozzle is used in high-speed or hypersonic vehicles and wind tunnel tests in the aerospace field. In the state of hypersonic flight, the throat section of the diffuser-convergent structural part of the rectangular nozzle needs to withstand the harsh working conditions of high pressure and high temperature exceeding 2100 °C; in order to improve the diffusion-convergent structural part of the rectangular nozzle under high temperature and high pressure The service life of the cooling system is generally designed with a complex active cooling structure composed of stainless steel and copper alloy with many thin-walled channels. [0003] Due to the special diffusion-convergence structure of the rectangular nozzle throat section, part of the we...

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Problems solved by technology

[0003] Due to the special diffusion-convergence structure of the rectangular nozzle throat section, part of the welding surface is a curved surface, and the overall brazing of the rectangular nozzle requires high tooling, which is difficult to clamp and process, and the sealing of the brazing surface is not good. to guarantee

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