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A kind of flux-cored aluminum solder 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 the reduction of melting temperature interval, improving the strength and hardness of the brazing joint, and improving the spreadability

Active Publication Date: 2022-07-26
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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  • A kind of flux-cored aluminum solder and preparation method thereof
  • A kind of flux-cored aluminum solder and preparation method thereof
  • A kind of flux-cored aluminum solder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The present embodiment discloses a flux-cored aluminum brazing filler metal, which includes a flux flux core and an aluminum-based brazing filler metal, and the specific mass fraction of each substance is shown in Table 1; the aluminum-based brazing filler metal wraps the flux flux core;

[0037] The preparation method of flux-cored aluminum brazing filler metal in the present embodiment includes the following steps:

[0038] Step 1. Weigh the corresponding quality of Si powder, Al-Cu alloy powder (containing 30% Cu), Al-Ge alloy powder (containing 50% Ge), Al-Zn alloy powder (containing 90% Zn), AlF 3 Powder, CsF powder, KF powder, dry for use; in this embodiment, the particle size of the silicon powder is 100 to 120 nm;

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

[0040] Step 2: Roll the brazing material into a tubular structure with a helical lap joint, and add the flux core powder into the tubular structure during the rolling process; the alumi...

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 size of the silicon powder in this embodiment is 100 to 120nm.

[0046] The aluminum-based solder includes the following substances by mass percentage: 4% Si, the remainder 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 size of the silicon powder in this example is 90 to 110nm.

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

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Abstract

The invention discloses a flux-cored aluminum brazing filler metal including flux flux core and aluminum-based brazing filler metal, wherein the aluminum-based brazing filler metal wraps the flux flux core; 9.2%AlF 3 powder, 1.7% to 7.5% CsF powder, 1.2% to 5.3% KF powder, 11% to 25.3% alloy powder, 4% to 8% Si powder, and the balance is aluminum-based solder; the invention also discloses the flux core The preparation method of aluminum brazing filler metal; in the invention, an aluminum-silicon eutectic reaction occurs during the brazing process, the melting point is low, the 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-cored solder is a kind of material-saving and emission-reduction type composite solder product that has appeared in recent years. Compared with traditional solder, flux-cored solder has the advantages of precise and controllable amount of flux, less pollution, and higher production efficiency. Aluminum-silicon eutectic alloy has good wettability, fluidity and corrosion resistance, and high strength of brazing joint, which is an ideal brazing material. However, its processing performance is not strong, and it is not easy to be processed 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 reduce the melting point of the solder and narrow the melting range of the solder. Cu can reduce the melting poin...

Claims

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Application Information

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Patent Type & Authority Patents(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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