Vacuum brazing process of copper-aluminum (Cu-Al) pipe panel radiator

A brazing process and radiator technology, applied in the field of copper-aluminum tube plate radiator manufacturing, can solve problems such as trouble, deformation processing, poor working environment, etc., and achieve the effects of reducing environmental pollution, solving post-weld deformation, and solving troublesome processing.

Active Publication Date: 2011-08-17
WUXI MASHAN YONGHONG HEAT EXCHANGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a vacuum brazing process for copper-aluminum tube-plate radiators, which not only solves the problem

Method used

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  • Vacuum brazing process of copper-aluminum (Cu-Al) pipe panel radiator
  • Vacuum brazing process of copper-aluminum (Cu-Al) pipe panel radiator
  • Vacuum brazing process of copper-aluminum (Cu-Al) pipe panel radiator

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Embodiment 1: A vacuum brazing process for a copper-aluminum tube-plate radiator, including the following process steps:

[0021] (1) A serpentine-shaped liquid pipe groove is milled on the aluminum plate 6, and the shape of the liquid pipe groove matches the copper pipe 7;

[0022] (2) Place the solder foil 8 of Zn89AlCu brand in the liquid pipe groove, and then place the copper tube 7 in the liquid pipe groove, such as figure 1 Shown

[0023] (3) Fix the aluminum plate 6 with tooling and place it in a vacuum furnace for welding; the welding conditions are:

[0024] a. Heat to 260℃ for 1.5 hours, vacuum degree ≥9.0×10 -3 Pa;

[0025] b. Heat to 365℃ for 1.5 hours, vacuum degree ≥5.6×10 -3 Pa;

[0026] c. After heating to 395℃ for 15 minutes, the power will be cut off and the temperature will be reduced. The vacuum degree is ≥5.6×10 -3 Pa;

[0027] d. Cut off the power and cool down to 290°C, and the temperature will be cooled for 45 minutes, then out of the furnace.

Example Embodiment

[0028] Embodiment 2: A vacuum brazing process for a copper-aluminum tube-plate radiator, including the following process steps:

[0029] (1) A serpentine-shaped liquid pipe groove is milled on the aluminum plate 6, and the shape of the liquid pipe groove matches the copper pipe 7;

[0030] (2) Place the solder foil 8 of Zn89AlCu brand in the liquid pipe groove, and then place the copper tube 7 in the liquid pipe groove, such as figure 1 Shown

[0031] (3) Fix the aluminum plate 6 with tooling and place it in a vacuum furnace for welding; the welding conditions are:

[0032] a. Heat to 280℃ for 1 hour, vacuum degree ≥9.0×10 -3 Pa;

[0033] b. Heat to 375℃ for 1 hour, vacuum degree ≥5.6×10 -3 Pa;

[0034] c. After heating to 410℃ for 10 minutes, the power will be cut off and the temperature will be reduced. The vacuum degree is ≥5.6×10 -3 Pa;

[0035] d. Cut off the power and cool down to 300°C, and the temperature will be lowered for 30 minutes, then out of the furnace.

Example Embodiment

[0036] Embodiment 3: A vacuum brazing process for a copper-aluminum tube-plate radiator, including the following process steps:

[0037] (1) A serpentine-shaped liquid pipe groove is milled on the aluminum plate 6, and the shape of the liquid pipe groove matches the copper pipe 7;

[0038] (2) Place the solder foil 8 of Zn89AlCu brand in the liquid pipe groove, and then place the copper tube 7 in the liquid pipe groove, such as figure 1 Shown

[0039] (3) Fix the aluminum plate 6 with tooling and place it in a vacuum furnace for welding; the welding conditions are:

[0040] a. Heat to 270℃ for 1.2 hours, vacuum degree ≥9.0×10 -3 Pa;

[0041] b. Heat to 370℃ for 1.2 hours, vacuum degree ≥5.6×10 -3 Pa;

[0042] c. After heating to 400℃ for 12 minutes, the power will be cut off and the temperature will be reduced. The vacuum degree is ≥5.6×10 -3 Pa;

[0043] d. Cut off the power and cool down to 295°C, the cooling time is 35min, and it is out of the furnace.

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Abstract

The invention relates to a vacuum brazing process of a copper-aluminum (Cu-Al) pipe panel radiator. The vacuum brazing process is characterized by comprising the following steps: (1) milling a liquid infusion pipe groove on an aluminum plate, wherein, the shape of the liquid infusion pipe groove is matched with that of a copper pipe; (2) placing a brazing foil in the liquid infusion pipe groove, and then placing the copper pipe in the liquid infusion pipe groove; and (3) fixing and tightly pressing the aluminum plate by tooling, and then placing the aluminum plate in a vacuum furnace for welding under the conditions as follows: a. heating to 260-280 DEG C, and performing heat preservation for 1-1.5 hours under the vacuum degree of not less than 9.0*10<-3>Pa; b. heating to 365-375 DEG C, and performing heat preservation for 1-1.5 hours under the vacuum degree of not less than 5.6*10<-3>Pa; c. heating to 395-410 DEG C, performing heat preservation for 10-15 minutes, and powering off forcooling under the vacuum degree of not less than 5.6*10<-3>Pa; and d. cooling to 290-300 DEG C within 30-45 minutes after powering off, and finally taking out the aluminum plate from the furnace. In the process, the copper pipe is in a snake shape, and the liquid infusion pipe groove is also in a snake shape matched with the copper pipe. By utilizing the vacuum brazing process, problems such as poor working environments as well as post-welding deformation and troublesome treatment of the product are solved, and meanwhile the purposes of quantity production and product quality improvement are realized.

Description

technical field [0001] The invention relates to a vacuum brazing process, in particular to a vacuum brazing process for a copper-aluminum tube-plate radiator, and belongs to the field of manufacturing copper-aluminum tube-plate radiators. Background technique [0002] For copper-aluminum tube-sheet radiators, the realization of dissimilar metal connections is the key technology. The existing connection methods are argon arc welding and flame brazing. The argon arc welding connection is not only labor-intensive, the working environment is poor, and the product is easily deformed after welding; the flame brazing connection is not only low in work efficiency, but also needs to clean up the residual flux on the product surface after welding to avoid residual flux on the product. Corrosion is caused, and the above two processes are not easy to achieve mass production and form dense welds. Contents of the invention [0003] The purpose of the present invention is to overcome t...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K3/08
Inventor 张成刘青林
Owner WUXI MASHAN YONGHONG HEAT EXCHANGER
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