Bromide soldering flux for copper-aluminum soldering

Abstract

The invention discloses a bromide soldering flux for copper-aluminum soldering. The bromide soldering flux comprises a substrate, a solvent and a film removal agent; according to weight percentage, zinc bromide (ZnBr2) serving as the substrate accounts for about 24 to 25 percent, ammonium bromide (NH4Br) serving as the solvent accounts for about 74 to 75 percent, and sodium fluoride serving as the film removal agent accounts for about 1 to 2 percent. The prepared bromide soldering flux has the characteristics of fast consumption in a soldering process and low postwelding residue, and can avoid corrosion of a copper-aluminum joint caused by the residual soldering flux after welding. Moreover, the service life of the copper-aluminum soldering joint prepared from stannum, zinc and copper soldering flux reaches more than 14 years, and the bromide soldering flux is applicable for the environment of an air conditioner refrigeration pipeline.

Description

technical field

[0001] The invention relates to a flux for copper-aluminum brazing, in particular to a bromide flux for copper-aluminum brazing. technical background

[0002] As the shortage of copper resources becomes increasingly prominent and its price increases year by year, the copper aluminization of refrigeration pipelines is particularly urgent. However, the existing copper-aluminum welding processes, such as energy storage welding, friction welding, resistance welding, and explosive welding, cannot meet the requirements of welding space and online production; and the Locke ring cannot meet the requirements of cost and compactness. Therefore, from a comprehensive analysis of cost, compactness, and on-site operation, the brazing method is the most suitable copper-aluminum connection method for refrigeration pipeline welding.

[0003] Brazing between different materials has different technical requirements. There are various problems in copper-aluminum brazing with t...

Examples

Embodiment 1

[0020] Add 2.4 kg of zinc bromide into an enamel kettle with a stirring device, then add 7.4 kg of ammonium bromide and 0.2 kg of sodium fluoride. After the three are thoroughly stirred, use 200-mesh stainless steel mesh to filter out impurities, that is Flux mixtures are available. Store in airtight plastic buckets.

Embodiment 2

[0022] Put 2.5 kg of zinc bromide, 7.4 kg of ammonium bromide, and 0.1 kg of sodium fluoride into a planetary mixer and mix them thoroughly before subpackaging. Store in airtight plastic buckets.

Embodiment 3

[0024] Add 2.4 kg of zinc bromide to an enamel kettle with a stirring device, then add 7.5 kg of ammonium bromide and 0.1 kg of sodium fluoride, and stir the three thoroughly, then use 200-mesh stainless steel mesh to filter out impurities, that is Flux mixtures are available. Store in airtight plastic buckets.

technical field

[0001] The invention relates to a flux for copper-aluminum brazing, in particular to a bromide flux for copper-aluminum brazing. technical background

[0002] As the shortage of copper resources becomes increasingly prominent and its price increases year by year, the copper aluminization of refrigeration pipelines is particularly urgent. However, the existing copper-aluminum welding processes, such as energy storage welding, friction welding, resistance welding, and explosive welding, cannot meet the requirements of welding space and online production; and the Locke ring cannot meet the requirements of cost and compactness. Therefore, from a comprehensive analysis of cost, compactness, and on-site operation, the brazing method is the most suitable copper-aluminum connection method for refrigeration pipeline welding.

[0003] Brazing between different materials has different technical requirements. There are various problems in copper-aluminum brazing with t...

Examples

Embodiment 1

[0020] Add 2.4 kg of zinc bromide into an enamel kettle with a stirring device, then add 7.4 kg of ammonium bromide and 0.2 kg of sodium fluoride. After the three are thoroughly stirred, use 200-mesh stainless steel mesh to filter out impurities, that is Flux mixtures are available. Store in airtight plastic buckets.

Embodiment 2

[0022] Put 2.5 kg of zinc bromide, 7.4 kg of ammonium bromide, and 0.1 kg of sodium fluoride into a planetary mixer and mix them thoroughly before subpackaging. Store in airtight plastic buckets.

Embodiment 3

[0024] Add 2.4 kg of zinc bromide to an enamel kettle with a stirring device, then add 7.5 kg of ammonium bromide and 0.1 kg of sodium fluoride, and stir the three thoroughly, then use 200-mesh stainless steel mesh to filter out impurities, that is Flux mixtures are available. Store in airtight plastic buckets.