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A kind of low melting point composite self-brazing aluminum solder and preparation method thereof

A kind of aluminum brazing filler metal, low melting point technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problem of Si element cannot be dissolved, avoid uneven alloy composition defects, good brazing effect, convenient brazing Effects of welding operations

Active Publication Date: 2016-01-06
ZHEJIANG XINRUI WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the Zn-Al-Si alloy is smelted, the smelting process should be stricter than the general alloy smelting, otherwise it is easy to prevent the Si element from being dissolved into the alloy matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. The ratio of each composition

[0023] Select 5kg of 4047 (Al-12Si) alloy wire (64%) with a diameter of 1.6mm, weigh 1.01kg of zinc powder (13%); 1.17kg of non-corrosive fluoroaluminate flux (15%); 0.63kg binder (8%).

[0024] 2. Preparation method

[0025] 1. Mix the obtained powders and pass through a 100-mesh sieve;

[0026] 2. Add the uniform powder into the binder, stir evenly, and add it to the coating device;

[0027] 3. Select 1.6mm Al-12Si alloy wire, and make it pass through a fixed track with a coating device, and coat the welding wire at a fixed position, so that the paste is evenly coated around the aluminum-silicon alloy;

[0028] 4. Pass through the heating pipe at a constant speed, so that the aluminum-silicon alloy and the surrounding paste are combined and dried, and finally a composite solder wire with a diameter of 2.0mm is obtained.

[0029] 3. Beneficial effects

[0030] The composite welding wire prepared in this embodiment has excellent w...

Embodiment 2

[0032] Select 5kg of 4047 (Al-12Si) alloy (43%) with a diameter of 1.2mm according to the mass percentage, weigh 2.90kg of zinc powder (25%); 1.98kg of non-corrosive fluoroaluminate flux (17%); 1.74 kg of binder (15%).

[0033] A composite solder wire with a diameter of 1.5 mm was prepared according to the preparation method of Example 1.

[0034] The composite welding wire prepared in this embodiment has excellent wettability and permeability on the surface of the 6-series high-strength aluminum alloy, excellent mechanical properties of the brazing seam, and excellent air tightness. When flame brazing 6061 aluminum alloy workpieces, the brazing temperature is low, no need to add flux before welding, no need to clean after welding, and easy to operate.

Embodiment 3

[0036] Select 5kg of 4045 (Al-10Si) alloy (73%) with a diameter of 1.6mm according to the mass percentage, weigh 0.68kg of zinc powder (10%); 0.75kg of non-corrosive fluoroaluminate flux (11%); 0.41 kg of binder (6%).

[0037] A composite solder wire with a diameter of 1.8 mm was prepared according to the preparation method of Example 1.

[0038] The composite welding wire prepared in this embodiment has excellent wettability and permeability on the surface of the 6-series high-strength aluminum alloy, excellent mechanical properties of the brazing seam, and excellent air tightness. When flame brazing 6061 aluminum alloy workpieces, the brazing temperature is low, no need to add flux before welding, no need to clean after welding, and easy to operate.

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Abstract

The invention relates to the field of brazing materials, in particular to a low-melting-point composite self-fluxing aluminum brazing filler metal and a preparation method thereof. The low-melting-point composite self-fluxing aluminum brazing filler metal is formed by a core part and an outer layer, wherein the core part is made of aluminum-silicon alloy and the outer layer is made of zinc powder, flux and binder. The preparation method comprises the steps of weighing the zinc powder, the flux and the binder according to proportions, uniformly mixing to obtain paste and then coating the paste mixture on the outer side of the core part made of the aluminum-silicon alloy to form the outer layer. The low-melting-point composite self-fluxing aluminum brazing filler metal is suitable for the welding of aluminum alloy pipeline parts of various grades.

Description

technical field [0001] The invention relates to the field of brazing materials, in particular to a low melting point composite self-brazing aluminum solder and a preparation method thereof. Background technique [0002] At present, the application of aluminum and aluminum alloys is becoming more and more extensive. In many industries, the use of 3-series (such as 3003 aluminum alloy) and 6-series (such as 6061 aluminum alloy) high-strength aluminum alloys to manufacture all-aluminum structural parts has become an all-aluminum structural component. The development direction of the world's manufacturing industry. However, the brazing problem of high-strength aluminum alloys still exists, especially the melting point of many high-strength aluminum alloys is much lower than that of pure aluminum, so it cannot be brazed with conventional commercially available aluminum-silicon filler metals. [0003] The difficulty and demand of brazing high-strength aluminum alloys has attracte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/14B23K35/24B23K35/40
CPCB23K35/0227B23K35/286B23K35/361B23K35/362B23K35/404
Inventor 戴玮王水庆杨金龙孙波娄银斌娄江
Owner ZHEJIANG XINRUI WELDING MATERIAL
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