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Magnesium alloy middle temperature brazing material

A magnesium alloy and brazing material technology, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of poor joint performance, poor surface spreadability, and high cost of brazing material

Inactive Publication Date: 2008-12-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, alloy systems such as Mg-Al-Cd-Ni, Al-Zn, Mg-Zn, pure Al, In-Mg-Zn-Al have been used in the research of magnesium alloy solders, but most of them have poor manufacturability or poor joint quality. Due to technical problems such as poor performance, there is no generally accepted solder with good comprehensive performance.
For example, the melting temperature of Mg-Al-Cd-Ni is high, reaching 560-580°C; the surface spreadability of Al-Zn and Mg-Al is poor; the strength of pure Al sheet brazing joints is not enough; In-Mg-Zn-Al The solder contains more In, and the cost of the solder is higher

Method used

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  • Magnesium alloy middle temperature brazing material
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  • Magnesium alloy middle temperature brazing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The main chemical composition and mass percentage of the solder are: 2.5% Al, 52.0% Zn, and the balance Mg. The solder alloy is smelted by the flux protection method, poured into ingots, and then the solder is divided into strips and blocks by mechanical division. Before brazing, the magnesium alloy workpiece is cleaned with sandpaper and acetone to remove surface dirt and oxide film. The brazing material is placed at the joint, and flux is sprinkled on it. The joint is fixed by a clamp and then brazed in an argon protection device. During the brazing process, the argon gas flow rate is 10L / min, the heating rate is 2.5°C / s, the brazing temperature is 380°C, and the heat preservation time is 30s. After brazing, the appearance of the joint is well formed, and the mechanical test is carried out on it. The shear strength and tensile strength of the joint are shown in Table 1.

[0027] figure 1 It is the microstructure diagram of the alloy. It can be seen from the figure t...

Embodiment 2

[0032] The main chemical composition and mass percentage of the solder are: 1.0% Al, 48.0% Zn, and the balance Mg. The solder alloy is smelted by the flux protection method, poured into ingots, and then the solder is divided into strips and blocks by mechanical division. Before brazing, the magnesium alloy workpiece is cleaned with sandpaper and acetone to remove surface dirt and oxide film. The brazing material is placed at the joint, and flux is sprinkled on it. The joint is fixed by a clamp and then brazed in an argon protection device. The brazing temperature is 390° C., and other brazing process parameters are the same as in Example 1. After brazing, the appearance of the joint is well formed, and the mechanical test is carried out on it. The shear strength and tensile strength of the joint are shown in Table 1.

Embodiment 3

[0034] The main chemical composition and mass percentage of the solder are: 2.0% Al, 47.0% Zn, and the balance Mg. The solder alloy is smelted by the flux protection method, poured into ingots, and then the solder is divided into strips and blocks by mechanical division. Before brazing, the magnesium alloy workpiece is cleaned with sandpaper and acetone to remove surface dirt and oxide film. The brazing material is placed at the joint, and flux is sprinkled on it. The joint is fixed by a clamp and then brazed in an argon protection device. The brazing temperature is 400° C., and other brazing process parameters are the same as in Example 1. After brazing, the appearance of the joint is well formed, and the mechanical test is carried out on it. The shear strength and tensile strength of the joint are shown in Table 1.

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Abstract

The invention relates to a magnesium alloy mid-temperature solder, belonging to the technical field of magnesium alloy welding. Most of the existing magnesium alloy solders have poor manufacturability, poor joint properties and other technical problems. The weigh percentage range of the components of the magnesium alloy mid-temperature solder of the invention is that: 1-2.5 percent of Al, 46-52 percent of Zn and the rest of Mg. The solder is smelted by a flux protection method; by using mechanical division, precision casting and a gas shielded ball milling method, the solders can be acquired in the forms of block, strip, powder and other forms. The melting temperature range of the solder is 336-361 DEG C; brazing temperature is low, which is 380-400 DEG C, and is suitable for magnesium alloy brazing having a solidus temperature over 400 DEG C. The solder of the invention has the advantages that brazing characteristics are good, and under the brazing temperature, spreading property and gap filling property are good; proper brazing methods include protective atmosphere brazing, induction brazing, furnace brazing and the like; the joint shear strength of brazing AZ31B magnesium alloy of the solder is more than 52 MPa, and the joint tensile strength is more than 72 MPa.

Description

technical field [0001] The invention relates to a magnesium alloy medium-temperature brazing filler metal, which belongs to the technical field of magnesium alloy welding connection. Background technique [0002] Magnesium and its alloys are the lightest metal structural materials, with low density, high specific strength, good vibration damping, good electromagnetic shielding, good electrical and thermal conductivity, good processability and thermoformability, and easy recycling. And received much attention. It has extremely important application value and broad application prospects in the fields of automobile, electronics, electrical appliances, transportation, aerospace, aviation and national defense military industry. However, the magnesium alloy brazing filler metal lacks the brazing filler metal with low melting point and good comprehensive performance. The brazing temperature of mature BMg-1 and BMg-2a brazing filler metals is above 570 ° C, and the melting point te...

Claims

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Application Information

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IPC IPC(8): B23K35/24
Inventor 贺定勇蒋建敏王立志李晓延栗卓新马力
Owner BEIJING UNIV OF TECH
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