Environment-friendly corrosion-free self-brazing solder for brazing aluminum alloy and copper alloy and preparation method thereof

A self-brazing and copper alloy technology, applied in welding equipment, metal processing equipment, welding/cutting media/materials, etc., can solve the problems of flux leakage, uneven flux, hollowness, etc., achieve stable performance and improve production Efficiency, the effect of reducing waste of resources

Active Publication Date: 2020-09-08
常州鑫力航金属新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of welding material has problems such as hollowness, uneven flux, and flux leakage (from the incision or the unsealed part of the sealing line) and other problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of zinc-aluminum alloy solder

[0027] Put pure aluminum into the smelting furnace, and put the covering agent cryolite on it; after the pure aluminum is melted, put in elemental zinc, and the furnace temperature rises to 750°C; then add sodium nitrate and graphite powder according to the mass ratio of 1:1 and mix The uniform refining flux is stirred to remove slag; then add the degassing refining agent dehydrated zinc chloride, and fully stir; finally put Fe and Cu in the form of simple powder particles, after fully stirring; it takes 4 minutes to reduce the furnace temperature to 660°C, pour the furnace charge into a centrifugal atomizer for cooling and atomization, the cooling rate is 104K / S, and the rotational speed of the centrifugal turntable is 3600r / min, to obtain zinc-aluminum alloy powder, and the specific composition of the zinc-aluminum alloy powder is controlled by weight percentage Calculated as Al 3.5%, Fe 0.25%, Cu 0.05%, Zn 96.2%.

[00...

Embodiment 2

[0041] Prepare zinc-aluminum alloy solder according to the method for embodiment 1;

[0042] The specific composition of the zinc-aluminum alloy powder is controlled to be 0.5% Al, 0.25% Fe, 0.05% Cu, and 99.2% Zn by weight percentage;

[0043] Others are the same as embodiment 1.

[0044] In this state, the melting temperature of the brazing material decreases, and the matching between the brazing material and the flux is poor during welding, resulting in insufficient strength of the solder joint after welding, and the corrosion resistance is also reduced.

[0045] The self-brazing ring is used for flame brazing of 3003 aluminum alloy and copper pipe fittings. The metallographic test of the welded joint is dense and basically free of pores; the tensile strength of the welded joint has been tested to reach 60Mpa; the welded joint does not need Any treatment, can withstand more than 300 hours of neutral salt spray test.

Embodiment 3

[0047] Prepare zinc-aluminum alloy solder according to the method for embodiment 1;

[0048]The specific composition of the zinc-aluminum alloy powder is controlled to be 5.5% Al, 0.25% Fe, 0.05% Cu, and 94.2% Zn by weight percentage;

[0049] Others are the same as embodiment 1.

[0050] In this state, the melting temperature of the solder increases, and the fluidity of the solder during welding is not good, so the ability of the solder to fill the seam is reduced, and it is easy to cause the problem of virtual soldering.

[0051] The self-brazing ring is used for flame brazing of 3003 aluminum alloy and copper pipe fittings, and there is a virtual weld in the metallographic test weld of the joint after welding; the tensile strength of the joint after welding has been tested to reach 88Mpa; the joint after welding does not need any Treatment, can withstand more than 500 hours of neutral salt spray test.

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Abstract

The invention belongs to the technical field of metal welding, particularly relates to brazing between dissimilar metals of aluminum alloy and copper alloy, and particularly relates to environment-friendly corrosion-free self-brazing solder for brazing the aluminum alloy and the copper alloy and a preparation method thereof. According to the self-brazing solder, zinc-aluminum alloy serves as brazing filler metal, cesium fluoroaluminate and potassium fluoroaluminate eutectic mixed salt serves as brazing flux, and the zinc-aluminum alloy brazing filler metal comprises, by weight, 0.5%-5.5% of Al, smaller than or equal to 0.5% of Fe, smaller than or equal to 0.25% of Cu and the balance Zn; and the brazing filler metal and the brazing flux are evenly mixed, stable product performance is guaranteed, and consistency of batch production is good.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and relates to brazing of dissimilar metals of aluminum alloy and copper alloy, in particular to an environment-friendly and non-corrosion self-brazing material for brazing aluminum alloy and copper alloy and a preparation method thereof. Background technique [0002] With the development of the economy, more and more industries have begun to popularize and apply aluminum alloy materials. Therefore, the application of brazing technology for aluminum alloys is becoming more and more widespread. At present, the mature application industries include automobiles and home appliances (refrigerators, air conditioners), etc. However, at present, the aluminum alloy cannot completely replace the copper alloy, so there will always be a connection between the aluminum alloy and the copper alloy. [0003] The connection between aluminum alloy and copper alloy currently has connection methods such as re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/36B23K35/40
CPCB23K35/282B23K35/3605B23K35/40
Inventor 张冬青史长满
Owner 常州鑫力航金属新材料有限公司
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