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Novel non-corrosive brazing flux used for silver brazing filler metal or copper-phosphorus-silver brazing filler metal

A non-corrosive, silver solder technology, applied in the direction of welding/cutting media/materials, welding media, metal processing equipment, etc., can solve the problem of moisture absorption and agglomeration of powdered solder, corrosiveness, and cannot be stored for a long time. question

Active Publication Date: 2012-05-23
SHUNDE SANSHENG ELECTRICAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Fluoride KF is very easy to absorb moisture, causing the powdered brazing flux to quickly absorb moisture and agglomerate, which cannot be stored for a long time, especially in humid areas; fluoride KBF 4 and / or KHF 2 Decomposes during brazing heating, producing toxic gas BF 3 Or HF steam, endangering the health of operators; fluoride KF is corrosive, and the flux residue after brazing will corrode the workpiece, so it must be cleaned, thereby increasing the production and wastewater treatment process

Method used

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  • Novel non-corrosive brazing flux used for silver brazing filler metal or copper-phosphorus-silver brazing filler metal
  • Novel non-corrosive brazing flux used for silver brazing filler metal or copper-phosphorus-silver brazing filler metal
  • Novel non-corrosive brazing flux used for silver brazing filler metal or copper-phosphorus-silver brazing filler metal

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Embodiment Construction

[0018] 1. The weight percent of flux components:

[0019] Lithium fluoride 28%

[0020] Boric anhydride 26%

[0021] Potassium Tetraborate 46%

[0022] Brazing Q235 carbon steel, 1Cr18Ni9Ti stainless steel and T2 red copper with brazing flux and brazing material BAg45CuZn (45Ag-30Cu-20Zn). The corresponding test results are shown in Table 1, and the comparison test results of QJ102 flux are listed in the same table.

[0023] Table 1

[0024]

[0025] 2. The weight percent of flux components:

[0026] Lithium Fluoride 18%

[0027] Boric anhydride 30%

[0028] Potassium tetraborate 52%

[0029] Use this brazing flux to braze Q235 low-carbon steel, 1Cr18Ni9Ti stainless steel, and T2 red copper with brazing material 25Ag-40Cu-33Zn-25Sn. The corresponding test results are shown in Table 2, and the comparison test results of QJ102 flux are listed in the same table.

[0030] Table 2

[0031]

[0032] 3. The weight percent of flux components:

[0033] Lithium Fluoride...

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Abstract

The invention provides a novel non-corrosive brazing flux used for a silver brazing filler metal or a copper-phosphorus-silver brazing filler metal, and aims to solve the technical problems of easy moisture absorption, easy caking, toxic gas generation, corrosivity and the like of the brazing flux in the prior art. The brazing flux provided by the invention comprises the following components in percentage by weight: 10 to 40 percent of lithium fluoride, 20 to 50 percent of boron anhydrous and the balance of potassium tetraborate. Matched with the corresponding brazing filler metal, the brazing flux of the invention is suitable for brazing of low-carbon steel, stainless steel, copper and copper alloys.

Description

technical field [0001] The invention relates to a new type of non-corrosive brazing flux used for silver solder or copper-phosphorus-silver solder, in particular to a green and environment-friendly brazing flux that does not absorb moisture, agglomerate, produce poisonous gas, and is non-corrosive. agent. Background technique [0002] At present, the most widely used flux is QJ102 when adopting silver solder or copper-phosphorus-silver solder to braze stainless steel, carbon steel, copper and copper alloy, and its composition (percentage by weight) is: 35% boric anhydride (B 2 o 3 ), 42% potassium fluoride (KF), 23% potassium tetrafluoride (KBF 4 ); In addition to the above ingredients, such fluxes sold abroad often contain KHF 2 . [0003] The components of this type of flux will have the following problems during use: [0004] Fluoride KF is very easy to absorb moisture, causing the powdered brazing flux to quickly absorb moisture and agglomerate, which cannot be stor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
Inventor 庄鸿寿刘占忠
Owner SHUNDE SANSHENG ELECTRICAL MFG CO LTD