A brazing method for a core transition section assembly

Abstract

The invention discloses a brazing method for a core body transfer section assembly, which comprises the following operations: processing the core body assembly and the surface to be brazed of the transfer section assembly respectively; uniformly coating red lead on the surface to be brazed of the transfer section assembly powder, then assemble the core assembly on the transfer section assembly, remove the core assembly from the transfer section assembly, and observe the distribution of the red lead powder on the surface to be brazed of the transfer section assembly and the surface to be brazed of the core assembly Condition; assemble the transfer section assembly, foil-shaped solder and core body assembly in turn, use brazing tooling to fix the transfer section assembly, foil-shaped solder and core body assembly, The contact parts of the body components are respectively brushed with solder resist; the assembled core body transition section components are placed in a vacuum brazing furnace for vacuum brazing. The invention aims at the welding difficulty of the core transition section assembly, reduces the difficulty of brazing and ensures the product quality.

Description

technical field [0001] The invention belongs to the technical field of aerospace precision manufacturing, and relates to a brazing method for a core transition section assembly. Background technique [0002] The engine heat exchanger core transfer section assembly is brazed by the core assembly and the transfer section assembly to form two cavities, A and B. The cavities must bear a pressure of 15MPa, and no strings of cavities are allowed. figure 1 and figure 2 It is a structural schematic diagram of an engine heat exchanger core transition section assembly, wherein the materials of the core body assembly and the transition section assembly are both high-strength duplex titanium alloys. Among them, the core component is made of multi-layer fins to form microchannels by diffusion welding, such as image 3 As shown; the transition section assembly contains multiple special-shaped channels, which are made by 3D printing, such as Figure 4 shown. [0003] Since the two cav...

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Problems solved by technology

[0003] Since the two cavities of the core transition section components A and B need to bear a pressure of 15MPa, stringing of cavities is not allowed, and the brazing area between the core transition section components A and B cavities is small (the width is only 4mm), And the internal brazing seam is invisible, and it cannot be remedied if there is a series of cavities; in addition, the core component and the transition section component are respectively made of diffusion welding and 3D printing, and the quality of diffusion welding and 3D printing cannot be affected during the brazing process of the two , therefore, it is very difficult to braze the two

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