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Bismuth-containing 4-series aluminum alloy suitable for brazing without brazing flux and preparation method

A flux-free, aluminum alloy technology, used in welding equipment, metal processing equipment, welding media, etc., can solve the problems of leakage welding, aluminum alloy brazing virtual welding, erosion, etc. The effect of improving welding quality and improving bonding strength

Pending Publication Date: 2021-04-06
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a bismuth-containing 4-series aluminum alloy suitable for flux-free brazing and a preparation method thereof in order to solve the problems of virtual welding, missing welding and corrosion in the existing aluminum alloy brazing

Method used

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  • Bismuth-containing 4-series aluminum alloy suitable for brazing without brazing flux and preparation method
  • Bismuth-containing 4-series aluminum alloy suitable for brazing without brazing flux and preparation method

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specific Embodiment approach 1

[0019] Specific Embodiment 1: In this embodiment, the bismuth-containing 4-series aluminum alloy suitable for flux-free brazing consists of Si: 9.5-11%, Mg: 1.3-2.0%, Fe: ≤0.3%, Cu: ≤0.02% , Mn: ≤0.1%, Zn: 0.015-0.04%, Bi: 0.01-0.06%, and the balance is made of Al. Fe, Cu, and Mn are impurity elements.

[0020] The addition of Mg element in the alloy of this embodiment can play a favorable role in vacuum brazing. In the flux-free vacuum brazing process, Mg element has a high vapor pressure and a low boiling point, and can be volatilized under vacuum conditions to remove residual oxygen and moisture in the vacuum and improve the effective vacuum degree. On the other hand, Mg vapor can also penetrate into the surface layer of the base metal under the oxide film and form a low melting point Al-Si-Mg alloy with the diffused Si to melt, thereby destroying the bond between the oxide film and the base metal, and making the molten solder along the aluminum alloy Surface wetting and ...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the bismuth-containing 4-series aluminum alloy suitable for flux-free brazing consists of Si: 10.46%, Mg: 1.91%, Fe: 0.17%, Cu : 0.004%, Mn: 0.003%, Zn: 0.01%, Bi: 0.04%, and the balance is made of Al.

specific Embodiment approach 3

[0025] Specific embodiment three: the preparation method of bismuth-containing 4-series aluminum alloy suitable for flux-free brazing in this embodiment is carried out according to the following steps:

[0026] 1. Melting:

[0027] According to mass percentage, Si: 9.5-11%, Mg: 1.3-2.0%, Fe: ≤0.3%, Cu: ≤0.02%, Mn: ≤0.1%, Zn: 0.015-0.04%, Bi: 0.01-0.06% and Al is the balance and weigh Al-20% Si master alloy, Al-Bi master alloy, Mg ingot, Zn ingot, and aluminum ingot for remelting as raw materials; when charging the furnace, add aluminum ingot for remelting first, then add Al-20 %Si master alloy and Al-Bi master alloy, raise the furnace temperature to 740°C~800°C, when the raw materials in the furnace soften and collapse, add Zn ingots evenly below the melt level in the furnace, and remove the slag after all the furnace materials are melted , after removing slag, control the temperature of the melt to 740-750°C, then add Mg ingots, stir for 10-15 minutes after all the raw mater...

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Abstract

The invention discloses bismuth-containing 4-series aluminum alloy suitable for brazing without brazing flux and a preparation method, and relates to 4-series aluminum alloy and a preparation method. The invention aims to solve the problems of pseudo soldering, solder skips and corrosion of existing aluminum alloy brazing. The aluminum alloy is prepared from, by mass percent, 9.5-11% of Si, 1.3-2.0% of Mg, smaller than or equal to 0.3% of Fe, smaller than or equal to 0.02% of Cu, smaller than or equal to 0.1% of Mn, 0.015-0.04% of Zn, 0.01-0.06% of Bi and the balance Al. The preparation method comprises the following steps of smelting to obtain an alloy melt, introducing the alloy melt into a standing furnace of a resistance reverberatory furnace, introducing chlorine for refining, adding a Na alterant, stirring, degassing, filtering and semi-continuously casting to obtain an ingot, and sequentially carrying out surface milling, hot rolling, coiling and cold finish rolling on the ingot to obtain a finished plate. The Mg element in the alloy can avoid local corrosion, and the Bi element can improve the bonding strength of an interface. The method is suitable for preparing the 4-series aluminum alloy.

Description

technical field [0001] The invention relates to a 4-series aluminum alloy and a preparation method thereof. Background technique [0002] As an important method of aluminum alloy connection, aluminum alloy brazing is different from other welding methods in terms of welding principle, process flow and welding equipment, which makes brazing show unique advantages in practical engineering applications: 1. Brazing heating temperature Low, usually far lower than the melting point of the base metal, which can realize the overall uniform heating of the brazing parts, the deformation of the brazing parts is small, and it is easy to ensure the dimensional accuracy of the welding parts. 2. It can braze weldments with complex structure, precision and poor joint accessibility. 3. The production efficiency is high, and the connection of multiple seams and multiple parts can be completed at one time. 4. It can realize welding between homogeneous and heterogeneous base metals. Based on ...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 鲁月任伟才吴沂哲王国军张晶刘玉龙吕丹张磊郑天
Owner NORTHEAST LIGHT ALLOY CO LTD
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