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Brazing filler metal for brazing Al-Mg-Zn magnesium alloy

A technology of al-mg-zn and magnesium alloy, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of high solder cost and high solder cost, and avoid oxidation and over-burning, Effect of good spreadability and gap filling properties

Inactive Publication Date: 2011-05-25
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A magnesium alloy solder In-Mg-Zn-Al newly developed by Japan (the melting temperature range of the solder is 449-490°C) contains a large amount of precious metal In (indium), of which the mass percentage of In accounts for about 65%. , which significantly increases the cost of brazing material[T. Watanabe, S. Komatsu, K.Oohara. Development of flux and filler metal for brazing magnesium alloy AZ31B[J].Welding Journal, 2005, 84(3): 37-40.]
In addition, the mass percentage of In in the magnesium alloy solder Mg-Sn-In-Al newly developed by Japan (the melting temperature range of the solder is 457-500°C) accounts for about 20%, and the cost of the solder is also relatively high.

Method used

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  • Brazing filler metal for brazing Al-Mg-Zn magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] a. According to the chemical composition and mass percentage of the solder: Zn: 11.6%, Mg: 27.7%, and the balance is Al;

[0017] b. Use the flux protection method to smelt the solder alloy, pour it into ingots, and then use mechanical division to divide the solder into long strips.

[0018] When using the brazing filler metal of the present invention to braze AZ31B magnesium alloy, the AZ31B magnesium alloy sample is polished with sandpaper and cleaned with acetone to remove surface dirt before brazing. The flux is evenly spread, and the joint is fixed by a clamp and placed in an argon protection device for high-frequency induction brazing. During the brazing process, the argon flow rate is 0.3L / min, the heating rate is 200°C / min, and the brazing temperature range is 490-510°C. After holding for 100s, cool to room temperature. After brazing, the appearance of the joint was well formed, and the shear strength and tensile strength of the brazed joint were measured, and ...

Embodiment 2

[0020] a. According to the chemical composition and mass percentage of the solder: Zn: 10.2%, Mg: 26.8%, and the balance is Al;

[0021] b. Use the flux protection method to smelt the solder alloy, pour it into ingots, and then use mechanical division to divide the solder into long strips.

[0022] When using the brazing filler metal of the present invention to braze AZ31B magnesium alloy, the AZ31B magnesium alloy sample is polished with sandpaper and cleaned with acetone to remove surface dirt before brazing. The flux is evenly spread, and the joint is fixed by a clamp and placed in an argon protection device for high-frequency induction brazing. During the brazing process, the argon flow rate is 0.3L / min, the heating rate is 200°C / min, and the brazing temperature range is 490-510°C. After holding for 100s, cool to room temperature. After brazing, the appearance of the joint was well formed, and the shear strength and tensile strength of the brazed joint were measured, and ...

Embodiment 3

[0024] a. According to the chemical composition and mass percentage of the solder: Zn: 11.1%, Mg: 25.1%, and the balance is Al;

[0025] b. Use the flux protection method to smelt the solder alloy, pour it into ingots, and then use mechanical division to divide the solder into long strips;

[0026] When using the brazing filler metal of the present invention to braze AZ31B magnesium alloy, the AZ31B magnesium alloy sample is polished with sandpaper and cleaned with acetone to remove surface dirt before brazing. The flux is evenly spread, and the joint is fixed by a clamp and placed in an argon protection device for high-frequency induction brazing. During the brazing process, the argon gas flow rate was 0.3 L / min, the heating rate was 300 °C / min, and the brazing temperature range was 490-510 °C. After holding for 100 s, cool to room temperature. After brazing, the appearance of the joint was well formed, and the shear strength and tensile strength of the brazed joint were mea...

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Abstract

The invention relates to brazing filler metal for brazing an Al-Mg-Zn magnesium alloy, which is characterized in that the brazing filler metal comprises the following raw materials in percentage by weight: 10-12% of Zn, 25-28% of Mg and balance of Al. The melting temperature range of the brazing filler metal for brazing the Al-Mg-Zn magnesium alloy provided by the invention is 439-468 DEG C, the brazing temperature range is 500-510 DEG C; and under the brazing temperature, the brazing filler metal has good spreadability and gap filling property and can be suitable for brazing the magnesium alloy the solidus temperature of which is above 510 DEG C. Especially, when the brazing is carried out on an AZ31B magnesium alloy joint by adopting a high-frequency induction brazing process, only the joint part is heated and the residual part of a substrate is less heated, thereby effectively avoiding the matrix material of an AZ31B magnesium alloy from being oxidized and overburned, the shear strength of brazing an overlap joint is 23-28MPa, and the tensile strength of brazing a butt joint is 39-44MPa.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy welding connection, in particular to an Al-Mg-Zn magnesium alloy brazing filler metal. Background technique [0002] Magnesium and its alloys are known as green engineering materials in the 21st century. They are currently the lightest metal structural materials. They have low density, high specific strength, good vibration damping, good electromagnetic shielding, electrical and thermal conductivity. It is favored because of its advantages such as good toughness, good processability, good thermoformability, and easy recycling. 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, there are few varieties of magnesium alloy solders that have been commercially used at present, such as the American BMg-1 (American Society ...

Claims

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Application Information

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IPC IPC(8): B23K35/28
Inventor 马力龙伟民乔培新于新泉张雷裴夤崟黄俊兰薛行雁齐剑钊程亚芳
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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