A kind of composite brazing material and brazing process

A technology of brazing material and brazing process, applied in the direction of welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve the problems of low welding quality, improve the yield of welded parts, reduce the brazing temperature, and improve The effect of weldment quality

Active Publication Date: 2021-06-11
广州有研焊接材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the welding process in the prior art has the technical problem of low welding quality

Method used

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  • A kind of composite brazing material and brazing process
  • A kind of composite brazing material and brazing process
  • A kind of composite brazing material and brazing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a composite brazing material and a brazing process, which specifically includes the following steps:

[0044] S1: Improve the lower die head of the existing tooling of the brazing machine. Change the material of the tooling lower die head of the brazing machine from asbestos to asbestos die head and add a graphite pad with better thermal conductivity and a thickness of 10mm to form a composite structure die head (see image 3 );

[0045] S2: Prepare a flux slurry made of a compound flux made of 60% cesium fluoroaluminate and 40% potassium fluoroaluminate and water at a weight ratio of 1.0:2.0;

[0046] S3: Apply the flux slurry to both sides of the aluminum plate brazed with the copper-aluminum-stainless steel composite material with a brush;

[0047] S4: Evenly sieve aluminum-silicon (Al88Si12) brazing material less than 60 mesh to more than 200 mesh on both sides of the aluminum plate coated with flux slurry, and the amount of sifting is 5kg...

Embodiment 2

[0053] This embodiment provides a composite brazing material and a brazing process, which specifically includes the following steps:

[0054] S1: Improve the lower die head of the existing tooling of the brazing machine. Change the material of the tooling lower die head of the brazing machine from asbestos to asbestos die head and add a graphite pad with better thermal conductivity and a thickness of 15mm to form a composite structure die head (see image 3 );

[0055] S2: Prepare a flux slurry made of a compound flux made of 80% cesium fluoroaluminate and 20% potassium fluoroaluminate and water at a weight ratio of 1.0:2.5;

[0056] S3: Apply the flux slurry to both sides of the aluminum plate brazed with the copper-aluminum-stainless steel composite material with a brush;

[0057] S4: Evenly sieve aluminum-silicon (Al88Si12) brazing material less than 70 mesh to more than 200 mesh on both sides of the aluminum plate coated with flux slurry, and the amount of sifting is 5kg...

Embodiment 3

[0063] This embodiment provides a composite brazing material and a brazing process, which specifically includes the following steps:

[0064] S1: Improve the lower die head of the existing tooling of the brazing machine. Change the material of the lower die head of the tooling of the brazing machine from asbestos to asbestos die head and add a graphite pad with better thermal conductivity and a thickness of 20mm to form a composite structure die head (see image 3 );

[0065] S2: The flux slurry is prepared by adjusting the compound flux made of 90% cesium fluoroaluminate and 10% potassium fluoroaluminate and water in a weight ratio of 1.0:3.0;

[0066] S3: Apply the flux slurry to both sides of the aluminum plate brazed with the copper-aluminum-stainless steel composite material with a brush;

[0067] S4: Evenly sieve aluminum-silicon (Al88Si12) brazing filler metal of less than 80 mesh to more than 200 mesh on both sides of the aluminum plate coated with flux slurry, and t...

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Abstract

The invention discloses a composite brazing material and a brazing process, which relate to the technical field of welding. This composite brazing material can be used for brazing connection of copper-aluminum-stainless steel composite material and aluminum and stainless iron. And specifically, the composite brazing material includes composite brazing flux and aluminum-silicon solder; the composite brazing flux includes cesium fluoroaluminate with a mass ratio of 60% to 90% and a melting range of 440 to 480°C , Potassium fluoroaluminate with a mass ratio of 40% to 10%. The brazing material has a low liquidus temperature, thereby effectively reducing the brazing temperature. The solder particles are smaller and the melting range is shorter, which greatly shortens the melting time. The compound flux can effectively improve the fluidity of the solder after melting. A graphite pad is set above the lower die head of the brazing machine, which can save the copper layer turning process before welding, so that the weldment can pass 10 times of 350 ℃ dry burning test and 30 times of 300 ℃ dry burning test after welding, effectively improving the quality of the weldment Yield rate, stable and improved weldment quality.

Description

technical field [0001] The invention relates to the field of welding technology, and in particular to a composite brazing material and a brazing process. Background technique [0002] Existing copper-aluminum-stainless steel composite material double-bottomed pan product is formed by composite brazing of multi-layer materials such as the first part composite material pan bottom, the second part heat-conducting aluminum and the third part stainless steel. Due to the poor thermal conductivity of the lower die head of the existing brazing equipment, the temperature of the brazing material used is relatively high, and local virtual welding often occurs, and even the outermost copper in the three-layer composite material melts at the edge of the brazing part. In order to ensure the quality of brazing, it is necessary to turn and remove the copper on the outermost layer of the copper-aluminum-stainless steel composite material to be welded. After brushing the flux and sifting the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/36B23K1/00
CPCB23K1/00B23K35/286B23K35/3601
Inventor 蔡沛沛蔡志红张碧波刘福平余华钢胡泽宇林业伟贺军四焦均志
Owner 广州有研焊接材料科技有限公司
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