Novel brazing flux used for stainless steel and aluminum brazing

A technology for aluminum brazing and stainless steel, applied in the field of new flux, can solve the problems of difficult welding, low melting point of aluminum and aluminum alloys, poor brazing performance, etc., and achieve the effects of low production cost, less residue and low cost

Inactive Publication Date: 2014-01-22
QINGDAO SHENGJIA INFORMATION TECH
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Problems solved by technology

[0002] Aluminum and aluminum alloy products are widely used for their low price and high specific stiffness and specific strength. However, due to the low melting point of aluminum and aluminum alloys and poor brazing performance, the brazing o

Method used

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Embodiment Construction

[0006] Below in conjunction with example the present invention will be further described:

[0007] A new type of flux used for brazing stainless steel and aluminum, the components of the flux are by weight percentage (unit: wt%): potassium tetrafluoroaluminate + potassium hexafluoroaluminate (KAlF 4 +K 3 AlF 6 ) eutectic 97.0 ~ 98.5, zinc fluoride (ZnF 2 )0.6~1.8, copper fluoride (CuF 2 ) 0.05~0.15, tin fluoride (SnF 4 ) 0.2~0.65; the potassium tetrafluoroaluminate + potassium hexafluoroaluminate (KAlF 4 +K 3 AlF 6 ) eutectic will form a non-corroding, non-moisture-absorbing coating on the surface of the base metal, which can effectively prevent the surface of the base metal from being oxidized and improve the chemical stability of the base metal; the zinc fluoride (ZnF 2 ), copper fluoride (CuF 2 ), tin fluoride (SnF 4 ) slightly corrodes the base metal, thereby forming grooves, which is beneficial to the wetting and spreading of the flux, and the weld is filled unde...

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Abstract

The invention relates to brazing flux used for brazing, in particular to novel brazing flux used for stainless steel and aluminum brazing. The composition of the brazing flux comprises potassium fluoroaluminate+potassium hexafluoroaluminate (KA1F4+K3A1F6) eutecticum, zinc fluoride (ZnF2), copper fluoride (CuF2), and stannic fluoride (SnF4). The novel brazing flux is free of corrosion, and ingredient preparation is simple and convenient, so that production cost is low. Under high temperature, the madefaction and the spreadability of the brazing flux are favorable to the madefaction and the spreadability of brazing filler metal. Welded products are thin in welding joint, high in strength, free of cold solder joints, free of brazing filler metal stacking, and small in residue of brazing flux after welding. Moreover, the residue is easy to clean up. The novel brazing flux used for stainless steel and aluminum brazing is low in cost, simple in preparation, and high in practical value.

Description

technical field [0001] The invention relates to a flux used for brazing, in particular to a novel flux used for brazing stainless steel and aluminum. Background technique [0002] Aluminum and aluminum alloy products are widely used for their low price and high specific stiffness and specific strength. However, due to the low melting point of aluminum and aluminum alloys and poor brazing performance, the brazing of aluminum and aluminum alloys has always been a material in recent years. It is a difficult problem in brazing, and the welding of aluminum and aluminum alloys with high melting point metals such as copper and iron is a more difficult problem. Contents of the invention [0003] The present invention aims to solve the above problems, and provides a novel brazing flux for stainless steel and aluminum brazing. Its use plays an important role in the welding between stainless steel and aluminum. There is no false welding, no solder accumulation, and less flux residue...

Claims

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Application Information

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IPC IPC(8): B23K35/28
CPCB23K35/3605B23K35/362
Inventor 刘海生倪海玲陈亚楠
Owner QINGDAO SHENGJIA INFORMATION TECH
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