Non-corrosive solder for soldering stainless iron and aluminium

A technology of aluminum brazing and stainless iron, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of low qualified rate of brazing

Inactive Publication Date: 2002-02-27
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The qualified rate of brazing is very low, only about 60%, it is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] According to weight percentage, take 95.0% of potassium fluoroaluminate eutectic, 3.00% of zinc fluoride, 0.5% of copper fluoride, and 1.5% of tin fluoride, and then ball mill to 200 mesh in a ball mill after mixing. The measured ultimate tensile strength is 29N / mm 2 .

Embodiment 2

[0012] The same as in Example 1. Take 95.0% of potassium fluoroaluminate eutectic, 4.0% of zinc fluoride, 0.2% of copper fluoride, and 0.8% of tin fluoride. The measured ultimate tensile strength is 32N / mm 2 .

Embodiment 3

[0014] The same as in Example 1. Take 97.5% of potassium fluoroaluminate eutectic, 1.2% of zinc fluoride, 0.4% of copper fluoride, 0.6% of tin fluoride, and 0.3% of cadmium fluoride. The measured ultimate tensile strength is 48N / mm 2 .

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Abstract

The present invention relates to a brazing flux for brazing metal, its composition includes (wt%) KAlF4+K3AlF6 cocrystal body 95.0-97.5, zinc fluoride 1.5-4.0, copper fluoride 0.2-0.5, tin fluoride 0.6-1.5 and cadmium fluoride 0.1-0.5. Said brazing flux is used for brazing stainless iron-aluminium.

Description

Technical field [0001] The invention relates to a flux for brazing of metals, in particular to a non-corrosive flux for brazing of different metals. Background technique [0002] The fluxes for stainless steel-aluminum brazing currently available on the market are potassium tetrafluoroaluminate + potassium hexafluoroaluminate (KAlF) 4+ K 3 AlF 6 ) Eutectic, successfully used for stainless steel-aluminum composite brazing, and the brazing qualification rate is greater than 99.9%. However, this flux is not suitable for stainless iron-aluminum welding. Taking potassium fluoroaluminate eutectic solder and silicon-aluminum eutectic solder as examples, the tensile strength of the stainless iron-aluminum welded is relatively low. The qualified rate of brazing is very low, only about 60%, and it is impossible to be used in industrial production in this industry. Summary of the invention [0003] The object of the present invention is to provide a non-corrosive flux for stainless iron-al...

Claims

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Application Information

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IPC IPC(8): B23K35/362
Inventor 陈志祥曾燕蔡志红蔡沛沛黄齐博
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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