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Preparation method of braze welding paste

A technology of brazing paste and paste, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of damage, excessive corrosion, high flux content, etc., and achieve the effect of low melting point, increased bonding force, and easy welding

Inactive Publication Date: 2018-05-04
SUZHOU CUBRAZING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the flux content in the current copper solder paste is high. Because fluoroborate is highly corrosive at high temperature, it will cause excessive corrosion and damage to the parts to be welded and the brazing equipment. After welding, the parts need to be cleaned. The corrosive volatiles in the welding process will also bring a series of problems to the working environment and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Take by weighing each component in the brazing material in the proportioning ratio of 95% by weight of tin, 4% by weight of silver and 1% by weight of copper, then place each component of the solder in the soldering material that weighs in the crucible , at 1180 ° C, and melted into solder under vacuum conditions; according to 15% by weight of polyethylene propylene, 81% by weight of diethylene glycol monoethyl ether, 3% by weight of fatty acid glycerides, and 1% by weight of The ratio of unsaturated fatty acids is weighed into each component in the paste, and then melted into a paste at 120°C;

[0025] 2) Add the weighed brazing filler metal and sebacic acid into the paste, stir and mix for 30 minutes, and stir evenly to obtain a molten material mixture, and obtain a brazing paste.

[0026] The prepared copper solder paste is mainly used for welding low-carbon steel parts. After welding, there is no residue on the surface of the parts, the weld seam is fine and dens...

Embodiment 2

[0028] 1) Take by weighing each component in the brazing material in the proportioning ratio of 95% by weight of tin, 4% by weight of silver and 1% by weight of copper, then place each component of the solder in the soldering material that weighs in the crucible , at 1180°C, and smelted into solder under vacuum conditions; by 15% by weight of polyethylene propylene, 81% by weight of diethylene glycol monoethyl ether, 3% by weight of nonionic surfactant and 1% by weight The proportioning ratio of % animal oil is weighed into each component in the paste, and then melted into a paste at 120°C;

[0029] 2) Add the weighed brazing material and succinic acid into the paste, stir and mix for 35 minutes, and stir evenly to obtain a molten material mixture, and obtain a brazing paste.

[0030] The prepared copper solder paste is mainly used for welding low-carbon steel parts. After welding, there is no residue on the surface of the parts, the weld seam is fine and dense, and it has ver...

Embodiment 3

[0032] 1) Take by weighing each component in the brazing material in the proportioning ratio of 95% by weight of tin, 4% by weight of silver and 1% by weight of copper, then place each component of the solder in the soldering material that weighs in the crucible , at 1180 ° C, and melted into solder under vacuum conditions; according to 15% by weight of polyethylene propylene, 81% by weight of dipropylene glycol monomethyl ether, 3% by weight of non-ionic surfactant and 1% by weight The proportioning ratio of the activator (containing unsaturated fatty acid and animal oil) is weighed into each component in the paste, and then melted into a paste at 120°C;

[0033] 2) Add the weighed brazing material and lauric acid into the paste, stir and mix for 45 minutes, and stir evenly to obtain a molten material mixture, and obtain a brazing paste.

[0034] The prepared copper solder paste is mainly used for welding low-carbon steel parts. After welding, there is no residue on the surfa...

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PUM

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Abstract

The invention discloses a preparation method of braze welding paste. The method comprises the following steps that 1, brazing filler metal and components in finished paste are weighed according to themoderate ratio, then the weighed finished paste and all components in the brazing filler metal are smelted into finished paste and brazing filler metal, and all the components are weighed according to the moderate ratio; 2, the weighed brazing filler metal and brazing flux are added into the finished paste and stirred and mixed for 30-45 minutes, the mixture is mixed uniformly to obtain the brazewelding paste. According to the method, by using a small amount of the brazing flux, fluorine-containing matter does not exist in the used brazing flux, organic matter is used, and corrosion to partsis remarkably low; moreover, the brazing filler metal is prepared from tin, silver and copper specially matched, and the obtained braze welding paste is low in melting point and easy to weld.

Description

technical field [0001] The invention relates to a preparation method of copper solder paste, which belongs to the technical field of welding materials. Background technique [0002] With the development of high-efficiency mass production of modern industrial automation brazing, the welded workpieces are increasingly miniaturized and mass-produced, and the shape of the weld seam is constantly diversified and complicated. It is the trend of the times to replace the traditional wire-like, ring-like and strip-like welding materials with paste-like welding materials-brazing paste to realize high-efficiency automatic welding production. In recent years, my country has continuously introduced foreign advanced automatic brazing production lines, such as flame automatic brazing production lines and protective atmosphere mesh belt furnace brazing production lines; at the same time, many domestic manufacturers have independently developed more advanced automatic brazing production line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40
CPCB23K35/40
Inventor 莫文剑
Owner SUZHOU CUBRAZING MATERIALS CO LTD
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