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Brazing flux used for braze welding of metal parts

A technology for metal parts and flux, applied in the field of flux for aluminum and stainless steel brazing, can solve problems such as the inability to obtain the quality of brazed joints, achieve satisfactory brazing joint quality, promote seam filling and flow distribution, and prevent oxidation.

Inactive Publication Date: 2009-09-23
JIANGMEN WEISITE WELDING MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of flux with low melting point is used for brazing aluminum and stainless steel, because the physical parameters of stainless steel are much different from aluminum, the satisfactory quality of brazing joints cannot be obtained.

Method used

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Embodiment Construction

[0008] A kind of flux used for brazing metal parts of the present invention, the raw material of described flux is made up of main material and auxiliary material, and the component of main material comprises hydrofluoric acid, aluminum hydroxide and potassium carbonate, and the component of auxiliary material comprises Cadmium oxide, Cadmium carbonate, Zinc oxide. The ratio among the hydrofluoric acid, aluminum hydroxide and potassium carbonate is 2:1:1. The hydrofluoric acid, aluminum hydroxide and potassium carbonate are all solutions, and their concentrations are respectively 50-60%, 40-60% and 40-60%. The above-mentioned hydrofluoric acid plays the role of heating and catalysis in the compound reaction; aluminum hydroxide is a high-white filler, which can absorb attachments; potassium carbonate is a gas adsorbent, which reacts with hydrofluoric acid to form potassium fluoroborate, which can be Coloring, arc extinguishing, enhancing fluidity and wettability of flux. Due ...

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Abstract

The invention discloses a brazing flux used for braze welding of metal parts. The material of the brazing flux consists of main material and accessories, wherein the main material comprises hydrofluoric acid, aluminium hydroxide and potassium carbonate and the accessories comprise cadmium oxide, cadmium carbonate and zinc oxide. After being melted, the brazing flux permeates into capillaries of parent metal to be melted with surface metal of the parent metal into alloy so as to remove an oxide film on the surface of brazing metal and brazing filler metal. The brazing flux can effectively prevent the oxidization of the brazing filler metal at high temperature, reduce the surface tension of the brazing filler metal in melting state and enhance the wettability to base metal by the brazing filler metal so as to promote the flushing and distribution of the brazing filler metal, lead the brazing filler metal to form good brazing seams whiling filling gap clearances so as to obtain the satisfactory quality of brazed joints.

Description

technical field [0001] The invention relates to a flux for brazing aluminum and other metals, in particular to a flux for brazing aluminum and stainless steel. Background technique [0002] There are multiple products of flux used for brazing of aluminum and aluminum, and aluminum and other metals. The flux described in British Patent No. 1055914 is a mixture of aluminum fluoride and potassium fluoride. This flux has a relatively high melting point (570° C. to 580° C.), so its application range is limited, and toxic gas will be generated when preparing the flux. When this kind of flux is used to form water slurry with commonly used aluminum-silicon solder, it is generally effective within 2 hours. When it is used for brazing aluminum and other metals, due to the difference in physical parameters such as the melting point and expansion coefficient of the two metals , it appears that the wettability and fluidity become poor, which reduces the quality of the brazed joint. The...

Claims

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Application Information

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IPC IPC(8): B23K35/363
Inventor 费建刚
Owner JIANGMEN WEISITE WELDING MATERIAL TECH
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