Brazing method for core body switching section assembly

Abstract

The invention discloses a brazing method for a core body switching section assembly. The brazing method for the core body switching section assembly comprises the following operation steps: the to-be-brazed surfaces of a core body assembly and a switching section assembly are machined separately; the to-be-brazed surface of the switching section assembly is evenly coated with red lead powder, then the core body assembly is assembled on the switching section assembly, the core body assembly is moved away from the switching section assembly, and the distribution situation of the red lead powder on the to-be-brazed surface of the switching section assembly and the distribution situation of the red lead powder on the to-be-brazed surface of the core body assembly are observed separately; the switching section assembly, foil-shaped brazing filler metal and the core body assembly are assembled in sequence, the switching section assembly, the foil-shaped brazing filler metal and the core body assembly are fixed through a brazing tool, and the contact portions of the brazing tool and the switching section assembly and the contact portions of the brazing tool and the core body assembly are coated with a resistance brazing flux separately; and the assembled core body switching section assembly is placed in a vacuum brazing furnace to be subjected to vacuum brazing. According to the invention, aiming at the welding difficulty of the core body switching section assembly, the brazing difficulty is reduced, and the product quality is ensured.

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...

AI Technical Summary

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

Images