A method for expanding and welding composite solid-phase diffusion connection of milling groove wall plate structure

Abstract

The invention discloses an expanding and welding composite solid diffusion connection method for a groove milling wall plate structure. Inner and outer walls are pressed through a melon petal-type flexible tool, and the solid diffusion connection method is formed under the common action of high temperature; under the action of the tool, the inner wall outwards presses the outer wall to achieve an expanding connection effect; meanwhile, under induction of pressure and high temperature, atoms are diffused quickly, so that a welding joint is formed between the inner wall and the outer wall; and Ar gas is used for protection, so that oxidization of a structural member is prevented, and volatilization of metals such as copper is inhibited. Heating temperature is lower than welding flux melting temperature; and in a welding process, no liquid phase is produced, so that the connection intensity is guaranteed, and the blockage defect caused by the fact that a welding flux is melted and enters a runner can be prevented. The expanding and welding composite solid diffusion connection method can be applied to most non-ferrous metals and steel groove milling wall plate structures, and no melting phenomenon is caused; problems of cracks, pores, inclusions, stress concentration and the like of fusion welding can be avoided; the method is simple in procedure, high in product quality and high in production efficiency; and furthermore, no substances, such as arc light and smoke dust, which are harmful to human are produced.

Description

technical field [0001] The invention relates to a solid phase diffusion connection method, in particular to a milling groove wall plate structure expansion welding composite solid phase diffusion connection method. Background technique [0002] Milling groove wall plate structure is currently the most widely used form of aircraft engine nozzle. Grooves and ribs are directly processed on the inner wall, and the regenerative cooling jacket is formed by connecting with the outer wall. Cooling liquid is passed into the flow channel to realize the cooling function. Engine nozzles play an important role in industrial production in the aerospace field and can directly affect the service life of aircraft. The inner wall of the nozzle is usually made of zirconium-copper alloy with high thermal conductivity, and the outer wall is made of high-strength stainless steel. Due to the large difference between the inner and outer materials of the milled groove wall plate structure, and the n...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems such as low forming accuracy, poor connection quality, heavy pollution, complex production process and high cost when connecting the inner and outer walls of the milling groove structure by means of electroplating, expansion joints, fusion welding, brazing and their combinations, this paper The invention provides a solid-phase diffusion connection method that utilizes a vacuum radiant heat source and flexible operation tooling to realize the expansion welding composite of the milled groove wall plate structure under the influence of the atomic diffusion process induced by the micro-deformation between the inner and outer walls.

Images