Flux-cored aluminum brazing filler metal and preparation method thereof

A technology of aluminum brazing material and flux core, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of lack of universal applicability, high melting point of pure metal powder, affecting the performance of brazing joints, etc., and achieve good fluidity , Brazing temperature is low, and the effect of improving the strength of the brazing seam

Active Publication Date: 2021-04-09
CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux-cored wire adopts the method of adding pure metal powder to the flux. The pure metal powder has a high melting point. During the brazing process, it is easy to cause particles to remain due to incomplete melting, forming a brittle intermediate phase and affecting the performance of the brazing joint.
And the high price of hafnium does not have universal applicability

Method used

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  • Flux-cored aluminum brazing filler metal and preparation method thereof
  • Flux-cored aluminum brazing filler metal and preparation method thereof
  • Flux-cored aluminum brazing filler metal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment discloses a flux-cored aluminum solder, which includes a flux core and an aluminum-based solder. The specific mass fractions of each substance are shown in Table 1; the aluminum-based solder wraps the flux core;

[0037] The preparation method of Chinese herbal cored aluminum solder in the present embodiment comprises the following steps:

[0038] Step 1, take respectively Si powder, Al-Cu alloy powder (containing 30% Cu), Al-Ge alloy powder (containing 50% Ge), Al-Zn alloy powder (containing 90% Ge) of corresponding quality in proportion Zn), AlF 3 Powder, CsF powder, KF powder, dry for subsequent use; The particle diameter of silicon powder is 100 to 120nm in the present embodiment;

[0039] Mix the powder evenly to obtain the target flux core;

[0040] Step 2. Roll the solder strip into a tubular structure with a spiral joint, and add flux core powder into the tubular structure during the rolling process; the aluminum-based solder includes the follo...

Embodiment 2

[0044] The main differences between this embodiment and Embodiment 1 are shown in Table 1.

[0045] Al-Cu alloy powder (containing 30% Cu), Al-Ge alloy powder (containing 50% Ge), Al-Zn alloy powder (containing 90% Zn); the particle diameter of silicon powder is 100% in the present embodiment to 120nm.

[0046] The aluminum-based solder includes the following substances by mass percentage: 4% Si, and the balance of Al.

Embodiment 3

[0048] The main differences between this embodiment and Embodiment 1 are shown in Table 1.

[0049] Al-Cu alloy powder (containing 35% Cu), Al-Ge alloy powder (containing 55% Ge), Al-Zn alloy powder (containing 97% Zn); the particle diameter of silicon powder is 90% in the present embodiment to 110nm.

[0050] The aluminum-based solder includes the following substances by mass percentage: 4% Si, and the balance of Al.

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Abstract

The invention discloses flux-cored aluminum brazing filler metal which comprises a brazing flux core and aluminum-based brazing filler metal. The brazing flux core is wrapped with the aluminum-based brazing filler metal. The flux-cored aluminum brazing filler metal comprises, by mass percent, 2.1%-9.2% of AlF3 powder, 1.7%-7.5% of CsF powder, 1.2%-5.3% of KF powder, 11%-25.3% of alloy powder, 4%-8% of Si powder and the balance aluminum-based brazing filler metal. The invention further discloses a preparation method of the flux-cored aluminum brazing filler metal. According to the flux-cored aluminum brazing filler metal, an aluminum-silicon eutectic reaction occurs in the brazing process, the melting point is low, fluidity and spreadability are good, and the brazing seam strength is high.

Description

technical field [0001] The invention relates to the technical field of solder, in particular to a flux-cored aluminum solder and a preparation method thereof. Background technique [0002] Flux core solder is a kind of material-saving and emission-reducing composite solder product that has emerged in recent years. It is made of a certain proportion of powdered flux and metal powder wrapped in a solder alloy sheath. Compared with traditional solders, flux-cored solders have the advantages of precise and controllable flux dosage, less pollution, and high production efficiency. Al-Si eutectic alloy has good wettability, fluidity and corrosion resistance, and high strength of brazed joints, so it is an ideal brazing material. However, its processing performance is not strong, and it is not easy to process into an ideal solder shape. Si powder can form Al-Si eutectic alloy with Al alloy in reaction brazing. Adding Ge to the Al-Si alloy can lower the melting point of the solder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 王朋旭何茜王博纠永涛樊志斌曲扬苏枫俞宏星
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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