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Formula of flux for middle temperature brazing magnesium-containing aluminum alloy

A magnesium-aluminum alloy, formula technology, applied in welding medium, welding equipment, metal processing equipment and other directions, can solve the problems of long welding time, narrow application range, hidden safety hazards, etc., to reduce the active temperature range, expand the scope of application, improve The effect of efficiency

Active Publication Date: 2011-11-23
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patents 86101487 and 200610161295.6 respectively describe a method of brazing magnesium-containing aluminum alloys, but the former formula contains silicon strontium lanthanum, and it is used in a hydrogen atmosphere. On the one hand, it is a safety hazard, and on the other hand, the cost is too high; the latter formula Using pure aluminum or 3A21 aluminum alloy solder not only has a narrow application range, but also takes too long to weld, resulting in changes in the properties of the welded workpiece material, and the brazing temperature of these two methods is above 595°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, take 200 grams of distilled water in a 1L tank, add 450 grams of aluminum trifluoride, 350 grams of potassium fluoride, 2 grams of beryllium difluoride, 1 gram of lithium fluoride, and 100 grams of cesium fluoride in sequence under rapid stirring. Until it is completely mixed and uniform, the mixture is kept at 150°C for 2 hours to remove water. The flux has a melting point of 490°C. Finally, it is coated on the surface of the base metal and brazed at 550°C under the protection of nitrogen atmosphere.

Embodiment 2

[0018] First, take 100 grams of deionized water in a 1L tank, add 350 grams of aluminum trifluoride, 450 grams of potassium fluoride, 1 gram of beryllium difluoride, 2 grams of lithium fluoride, and 50 grams of fluoride under rapid stirring. Cesium, until it is completely mixed, the mixture is kept at 150°C for 2 hours to remove water, the melting point of the flux is 508°C, and finally coated on the surface of the base metal, and brazed at 560°C under the protection of nitrogen atmosphere.

Embodiment 3

[0020] First, take 100 grams of distilled water in a 1L tank, add 400 grams of aluminum trifluoride, 400 grams of potassium fluoride, 1 gram of beryllium difluoride, 1.5 grams of lithium fluoride, and 80 grams of cesium fluoride in sequence under rapid stirring. Until it is completely mixed and uniform, the mixture is kept at 150°C for 2 hours to remove water. The flux has a melting point of 510°C, and is finally coated on the surface of the base metal, and brazed at 560°C under the protection of nitrogen atmosphere.

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Abstract

The invention relates to a formula for the braze welding of magnesium containing aluminum alloy, in particular to an intermediate temperature brazing flux formula which is applied to the braze welding of the magnesium containing aluminum alloy and of which the brazing temperature range is between 530 and 570 DEG C, and belongs to the welding technical field. Compared with the conventional chloride formula, the formula produces after-welding brazing flux residue which has the characteristics of no moisture absorption and no corrosivity; the formula better utilizes the characteristics of the phase diagram of a multicomponent compound, reduces the active temperature range of the brazing flux so as to be applied to the aluminum alloy with high strength level and low melting point, thereby widening the application range, lowering cost and improving the efficiency.

Description

technical field [0001] The invention relates to a formula suitable for brazing magnesium-containing aluminum alloys, in particular to a medium-temperature brazing flux formula suitable for brazing magnesium-containing aluminum alloys with a brazing temperature range of 530-570°C, which belongs to the field of welding technology . Background technique [0002] Magnesium-containing aluminum alloys are easy to form interstitial oxide films of alumina and magnesia, which have high chemical stability and are difficult to remove, which seriously hinders the wetting and spreading of solder. The role of the brazing flux is to melt before the brazing filler metal during heating and brazing, remove the oxide film on the surface of the aluminum alloy, and form a layer of liquid film attached to the surface of the base metal to promote the melting and spreading of the brazing filler metal on the aluminum alloy surface. achieve the purpose of protection. The traditional chloride alumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/363
Inventor 冯杏梅包晔峰
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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