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Soldering flux for welding magnesium-containing aluminum alloy

A magnesium-aluminum alloy and brazing flux technology, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem that the flux can not achieve the best effect, affect the brazing effect, and the solder can not be in a good liquid phase issues such as

Inactive Publication Date: 2017-05-10
薛亚红
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Problems solved by technology

[0004] However, in actual production, the brazing flux prepared by using this ratio cannot achieve the best effect in the brazing of magnesium-containing aluminum alloys.
Through analysis, it was found that ALF 3 : CsF=42.0:58.0 (molar ratio), the proportion of flux with a melting temperature of 471°C is mainly for pure aluminum structures or magnesium-free or low-magnesium aluminum alloys, because this ratio of flux is suitable for magnesium-containing aluminum alloys It has a special activity, but for aluminum alloys with high magnesium content, the magnesium will form magnesium fluoride with a high melting point with the fluorine in the flux, resulting in poor liquid phase of the solder, and Affect the effect of brazing

Method used

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Embodiment Construction

[0012] The technical solutions of the present invention are described below through specific examples, and the following examples are only for illustrating the present invention rather than limiting the scope of the present invention.

[0013] A flux for welding magnesium-containing aluminum alloys, the composition of which includes ALF 3 -CsF series flux, zinc fluoride, tin fluoride and iridium fluoride; of which ALF 3 : CsF (molar ratio)=42.5: 47.5 or 41.5: 48.5; the mass percent of each composition is, the ALF of 97.5-99.5% 3 - CsF, 0.2-2.0% zinc fluoride, 0.1-0.5% tin fluoride and 0.01-0.03% iridium fluoride.

[0014] The mass ratio of zinc fluoride to tin fluoride is 3:1.

[0015] The manufacturing process of the technical solution is the same as that of the prior art, and will not be described in detail.

[0016] The solder that matches with it is still a commonly used solder with a zinc-aluminum ratio of 80:20.

[0017] The above embodiments illustrate the technical...

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Abstract

The invention relates to soldering flux for welding a magnesium-containing aluminum alloy. The soldering flux is prepared from, by mass, 97.5%-99.5% of ALF3-CsF series soldering flux, 0.2%-2.0% of zinc fluoride, 0.1%-0.5% of stannic fluoride and 0.01%-0.03% of iridium fluoride, wherein the mole ratio of ALF3:CsF is 42.5:47.5 or 41.5:48.5.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a brazing material for welding aluminum and aluminum alloys. Background technique [0002] Because a layer of stable aluminum oxide film is formed on the surface of aluminum and aluminum alloy, brazing is difficult. At present, there are a lot of attentions on fluxes for brazing aluminum and aluminum alloys both at home and abroad. now recognized ALF 3 -The crystal phase diagram of CsF-based flux is considered to be the principle diagram guiding aluminum and aluminum alloy fluxes, and ALF is listed in the crystal phase diagram 3 : CsF=42.0:58.0 (molar ratio), the melting temperature is 471°C, which is considered to be the best choice. Therefore, this ratio is used for the flux in the existing aluminum and aluminum alloy fluxes. [0003] For example, the patent application with the Chinese patent application number CN200710029683 discloses a flux for welding aluminum and alumi...

Claims

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Application Information

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IPC IPC(8): B23K35/363
CPCB23K35/362
Inventor 薛亚红
Owner 薛亚红
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