Diffusion welding method for double alloy structure of plunger hydraulic pump motor rotor

Abstract

The invention discloses a plunger piston hydraulic pump motor rotor dual alloy structure diffusion welding method, which comprises the following steps that 1, the dimension of a workpiece to be welded is subjected to pretreatment; 2, the gasoline soaking ultrasonic processing, the blowing drying, the acid washing ultrasonic wave processing, the water flushing, the absolute ethyl alcohol soaking ultrasonic wave processing and the blowing drying are sequentially carried out; 3, a nickel foil is adopted to be used as a welding transition layer material, and a rotor steel substrate, a copper rod and a rotor end surface copper plate are assembled; 4, through the axial pressurization, an assembled rotor welding assembly is placed into a welding hearth to be subjected to diffusion welding. The method provided by the invention has the advantages that through the conventional diffusion welding on a rotor, a welding joint meeting the use requirements can also be obtained, and in addition, the problems caused by welding deformation can be avoided.

Description

technical field [0001] The invention relates to a diffusion welding of dissimilar materials, in particular to a method for diffusion welding of a double alloy structure of a plunger hydraulic pump motor rotor. Background technique [0002] Diffusion welding technology appeared in the early 1960s. With the development of my country's aviation technology, this technology has also been applied to some double alloy parts of our company's plunger hydraulic pump / motor since the early 1990s. Among them, the plunger The application of diffusion welding for the hydraulic pump / motor rotor dual alloy structure is relatively late, and the hot isostatic pressure diffusion welding process technology was used for welding in 2005. As we all know, solid-state diffusion welding is a welding method that uses local deformation of the material surface to make the contact surfaces adhere to each other under appropriate temperature and pressure, so as to realize the interatomic bonding of materials...

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Problems solved by technology

The uniaxial pressure of conventional diffusion welding is usually aimed at the flat plate, which can ensure the welding pressure on the welding surface to be equal during the welding process, but for the cylindrical welding surface such as the cylinder plunger hole, the uniaxial pressure causes welding The deformation of the test piece (reflected in the change of the radial and axial dimensions of the part due to axial pressure and thermal expansion of the material), as far as the conventional diffusion welding of the rotor is concerned, its welding deformation will lead to the deformation of the copper wall of the plunger hole processed by the rotor. Large thickness deviation

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