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Aluminum alloy vacuum brazing method with directional magnesium vapor slow-release

A brazing method and aluminum alloy technology, which is applied in the field of metal welding, can solve the problems of oxidation and burning on the surface of workpieces, reduce the wettability of brazing filler metals, and solder joints in brazing seams, etc., so as to reduce the degree of oxidation and burning and reduce oxygen content, the effect of reducing the area of ​​virtual welding

Active Publication Date: 2015-04-29
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vacuum degree in the vacuum furnace can generally only reach 1.0×10 -3 Around Pa, due to the presence of oxygen in the furnace, the surface of the workpiece after welding will be oxidized and burned; moreover, there is a dense oxide film on the surface of the aluminum alloy, which will reduce the wettability of the solder and hinder the soldering process. The spread of the material on the base metal causes defects such as brazed welds to appear.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The welding workpieces are the cold plate and cover plate with water channels. The length of the cold plate is 300 mm, the width is 300 mm, and the thickness is 30 mm; the thickness of the cover plate is 4 mm. The materials of the cover plate and the cold plate are both 6061 aluminum alloy. The specific operation steps of aluminum alloy vacuum brazing using magnesium vapor directional slow release are as follows:

[0016] (1) Put the magnesium chips into the stainless steel cylinder and the stainless steel box respectively; the size of the stainless steel cylinder is 6mm in inner diameter, 40mm in length, and 1mm in wall thickness; the two ends of the stainless steel cylinder are open, and four layers of nickel mesh are respectively arranged in the openings at both ends The size of the stainless steel box is 40mm in length, 16 mm in width, 20mm in height, and 1mm in wall thickness. The stainless steel box is an open box, and the box mouth of the stainless steel box is co...

Embodiment 2

[0032] The welding workpieces are cold plate and cover plate with water channel. The length of the cold plate is 400 mm, the width is 400 mm, and the thickness is 30 mm; the thickness of the cover plate is 4 mm. The material of the cover plate and the cold plate are both 6061 aluminum alloy. The specific operation steps of aluminum alloy vacuum brazing using magnesium vapor directional slow release are as follows:

[0033] (1) Same as embodiment 1;

[0034] (2) Put a lid on the lid of the stainless steel box, and the lid is evenly distributed with through holes; place thirteen stainless steel cylinders with magnesium chips near the weld of the workpiece to be welded, and the others are the same as in Example 1; The total amount of magnesium chips is 17g;

[0035] (3) Same as embodiment 1.

[0036] The obtained brazed joints are in good shape, there is no crack in the brazed seam, and there is no phenomenon such as false welding in ultrasonic testing, which meets the use requ...

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Abstract

The invention relates to an aluminum alloy vacuum brazing method with directional magnesium vapor slow-release. The method includes the specific steps: 1, placing magnesium chips into stainless steel cylinders with two ends open and open stainless steel boxes respectively by placing magnesium chips into each stainless steel cylinder and each stainless steel box; 2, placing a to-be-brazed aluminum alloy workpiece into a vacuum furnace, covering the to-be-brazed workpiece with a stainless steel process cover, placing two stainless steel boxes contained with the magnesium chips inside and outside the stainless steel cover respectively so as to decrease oxygen content in a furnace cavity and the process cover, placing more than one stainless steel cylinder nearby a brazing seam of the to-be-brazed workpiece, and enabling cylinder openings of the stainless steel cylinders to face towards the brazing seam; 3, closing a furnace door of the vacuum furnace, and heating for brazing. By the method, oxygen content in the vacuum furnace can be decreased greatly, surface oxidation and burning loss of the welded workpiece are reduced as compared with that of the prior art, brazed rate of the brazing seam is increased, and ultrasonic testing shows that cold joint area is decreased by about 20%.

Description

technical field [0001] The invention belongs to the technical field of metal welding, in particular to an aluminum alloy vacuum brazing process. Background technique [0002] Vacuum brazing technology is widely used in the connection and manufacture of aluminum and aluminum alloys. It has the advantages of small welding deformation and can weld various complex shapes of weldments. However, the vacuum degree in the vacuum furnace can generally only reach 1.0×10 -3 Around Pa, due to the presence of oxygen in the furnace, oxidation and burning will occur on the surface of the workpiece after welding; moreover, there is a dense oxide film on the surface of the aluminum alloy, which will reduce the wettability of the solder and hinder the soldering process. The spread of the material on the base metal causes defects such as virtual welding in the brazed weld. With the help of some metal activators, such as magnesium (Mg), bismuth (Bi), etc., it can effectively destroy the dense...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19
Inventor 梁宁李元生雷党刚杨靖辉李正
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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