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Self-brazing flux aluminum brazing filler metal plate and manufacturing method thereof

A production method and technology of aluminum brazing material, applied in the direction of manufacturing tools, welding/cutting media/materials, welding media, etc., can solve the problems of reducing welding strength, etc., to prevent oxidation, improve the utilization rate of raw materials, and good brazing activity Effect

Pending Publication Date: 2021-05-14
李珮豪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] CN101323065 discloses "a kind of preparation method of self-flux and brazing material", which adopts the mixing and pressing of brazing flux and aluminum brazing filler metal powder to form the brazing material of wire or ring, because aluminum or aluminum alloy powder as aluminum brazing filler metal is in After being produced in the inert gas, it will also be oxidized in the natural environment in contact with the natural environment. Therefore, the surface of the raw material of the aluminum solder has formed an oxide film (that is, aluminum oxide), and these oxide films improve the final brazing material. Oxygen content, and therefore need more flux to remove the oxide film, while high oxygen content will reduce the welding strength

Method used

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  • Self-brazing flux aluminum brazing filler metal plate and manufacturing method thereof
  • Self-brazing flux aluminum brazing filler metal plate and manufacturing method thereof
  • Self-brazing flux aluminum brazing filler metal plate and manufacturing method thereof

Examples

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Embodiment 1

[0068] Make self-fluxing aluminum brazing material according to the following steps.

[0069] (1) The solder used is an Al-Si base alloy, wherein the Si content is 6%; the solder used is potassium fluoroaluminate (K 3 AlF 6 ), prepare self-fluxing aluminum solder composite powder according to the following conditions:

[0070] Brazing filler metal flow rate 7.5kg / min metal temperature 720℃ Particle velocity 0.32kg / min Flux powder temperature 20℃ atomizing gas Nitrogen

[0071] The specific process is as follows: melt the Al-Si-based alloy at about 720°C to form an alloy melt; the Al-Si-based alloy melt forms a stream, and flows into the nitrogen atmosphere atomization chamber at a flow rate of 7.5kg / min; guided by the atomization nozzle Nitrogen gas is sprayed on the Al-Si-based alloy melt stream to produce a molten or semi-solidified melt droplet jet flow of the Al-Si-based alloy; nitrogen gas flow is used to blow potassium fluoroal...

Embodiment 2

[0091] By the same steps as in Example 1, a self-fluxing aluminum brazing filler metal plate of 400 mm long × 300 mm wide × 80 mm thick was produced, delivered to Shanghai Huafeng Aluminum Co., Ltd., and rolled and connected with 3003 aluminum alloy plates to produce Composite tubes for heat exchangers, and brazing experiments for tubes and fins of heat exchangers, and Shanghai Huafeng Aluminum Co., Ltd. inspected and tested the products.

[0092] The composite pipe produced by the rolling and pressing connection process is composed of a core layer of double-layer cladding, that is, the core layer of 3003 aluminum alloy is sandwiched between the self-fluxing solder layers of the present invention, wherein the total thickness of the composite plate is 0.6mm, the upper and lower self-fluxing aluminum solder layers account for 5% of the total thickness (that is, each 0.03mm). Silicon grain distribution, image 3 Show the self-fluxing aluminum brazing filler metal sheet material ...

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Abstract

The invention belongs to the technical field of brazing materials, and particularly relates to a self-brazing flux aluminum brazing filler metal plate. The plate comprises 1%-8% of brazing flux and balance aluminum brazing filler metal, wherein the aluminum brazing filler metal is Al-Si alloy with the Si content being 5%-12%, the relative density of the self-brazing flux aluminum brazing filler metal plate reaches 95.5%-99%, and the oxygen content is not higher than 300 ppm. The manufacturing method of the plate comprises the steps that (1) the brazing flux is manufactured, spherical brazing filler metal self-brazing flux aluminum brazing filler metal composite powder is completely coated with a coating layer, and the oxygen content is not higher than 300 ppm; the composite powder fills an aluminum sheath; the sheathed powder is vacuumized and heated; the powder is pressed, so that the relative density of the mixed powder reaches 95.5%-99%; and the aluminum sheath is removed after cooling. The self-brazing flux aluminum brazing filler metal plate manufactured through the method has good brazing activity and good plastic deformation, is suitable for further rolling, extruding, wire drawing and other processes, brazing filler metal profiles of various self-fluxing fluxes are manufactured, a self-fluxing flux brazing filler metal coating of a composite plate is formed through a rolling connection process, and the manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of brazing materials, in particular to a self-fluxing aluminum brazing material sheet and a manufacturing method thereof. Background technique [0002] For the brazing process of aluminum alloys, brazing filler metal and flux are two important combination components that are indispensable to the brazing process. Brazing filler metal is also called "brazing filler", which is brazed between aluminum parts Constitutes a weld, its melting point is lower than the melting point of aluminum welding parts, for example, such solders include Al-Si alloys, Al-Cu-Si alloys, Al-Cu-Si-Zn alloys, etc. In most cases, solder Usually, it is put into use as powdered brazing material and foil-shaped brazing filler metal, and some materials are rolled and pressed to form the cladding layer of the composite plate. [0003] Another important component of the brazing process is flux (brazing flux). During the brazing process, its ...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/363
CPCB23K35/286B23K35/362B23K35/0238B23K35/3603B23K35/3605
Inventor 李珮豪彭波
Owner 李珮豪
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