Low-temperature diffusion welding method for metal materials

A diffusion welding and metal material technology, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problem of low joint strength, shorten the time of heating and cooling, reduce production costs, and improve production efficiency.

Inactive Publication Date: 2011-05-04
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology

But at this time, the strength of the joint is not high, and it is necessary to continue to diff

Method used

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  • Low-temperature diffusion welding method for metal materials

Examples

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Embodiment 1

[0024] Low-temperature diffusion welding of nano-copper on its own surface.

[0025] (1) Preparation of raw materials: T2 copper plate is selected as the model raw material for nano-surface low-temperature diffusion welding, and one side of the copper plate is polished with metallographic sandpaper to obtain a surface with a smoothness that meets the requirements for use.

[0026] (2) Self-surface nano-treatment: use the dynamic rolling process at liquid nitrogen temperature to carry out self-surface nano-treatment, install the copper plate on the dynamic rolling surface nano-processing equipment, add liquid nitrogen to cool, and perform dynamic rolling treatment, and finally , a 0.4 mm thick nanostructured layer was obtained on the surface of the copper plate.

[0027] (3) Diffusion welding at constant temperature and pressure: Diffusion welding is performed on the copper plate treated in step (2) with the nano-sized surface as the welding surface. The welding specification i...

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Abstract

The invention discloses a low-temperature diffusion welding method for metal materials, comprising the following steps: 1) preparation of diffusion welding materials: selecting a metal plate material which can implement own nanosized surface as raw material for the diffusion welding, and polishing the surface to be welded through a mechanical method to meet certain requirement on roughness; 2) nanosize treatment on own surface: using a own surface nanosize method based on surface severe plastic deformation principle to prepare a nano structure surface layer on a surface of the plate material; 3) diffusion welding: cutting the surface nanosized plate material processed in the step 2) into proper size, mechanically polishing the nanosized surface to meet the roughness required by the diffusion welding, and preparing for performing low-temperature diffusion welding. The nanosized surface is contacted and placed in vacuum or reducing atmosphere, sequentially pressurizing and warming up to perform diffusion welding. The low-temperature diffusion welding method for the metal materials can reduce production cost on low-temperature welding and improve production efficiency.

Description

technical field [0001] The invention relates to a low-temperature diffusion welding method for metal materials, in particular to a process of diffusion welding after the surface of the metal material itself is nano-sized, and the diffusion welding temperature is significantly reduced. Background technique [0002] Diffusion welding refers to a solid-state welding method in which two workpieces to be welded are pressed together tightly, placed in a vacuum or a protective atmosphere, and under a certain pressure and temperature, atoms diffuse to each other to achieve a firm connection. [0003] Low-temperature diffusion welding referred to in the present invention refers to a process method in which the diffusion welding temperature is much lower than that of traditional high-temperature diffusion welding (for example, for Cu, it is expected to realize diffusion welding at 300-400°C, which is far lower than the traditional diffusion welding temperature of 800°C ). Surface nan...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/24
Inventor 李东于治水
Owner SHANGHAI UNIV OF ENG SCI
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