4004 aluminum alloy containing bismuth and tellurium for brazing and production method of 4004 aluminum alloy

A production method and aluminum alloy technology, applied in welding equipment, welding medium, metal processing equipment, etc., can solve the problem of not being able to significantly increase the wettability of the alloy during brazing, increasing the incidence of welding leaks, and the low pass rate of heat exchangers To achieve the effect of reducing the incidence of welding leaks, improving degassing efficiency and quality, and increasing wettability and spreadability

Active Publication Date: 2015-06-10
广西南南铝加工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The 4004 aluminum alloy for brazing disclosed in the above-mentioned document 1 prevents excessive oxidation during brazing by reducing the magnesium content. At the same time, this method cannot significantly increase the wettability of the alloy during brazing, and cannot destroy the oxide film. Reduced magnesium content leads to poor wettability of solder during vacuum brazing, increases the incidence of welding leaks, and leads to low pass rate of heat exchangers after vacuum brazing

Method used

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  • 4004 aluminum alloy containing bismuth and tellurium for brazing and production method of 4004 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Raw material and weight:

[0026] Its chemical composition is: Si: 9.0%, Mg: 1.0%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.20%, Sr: 0.02%, Bi: 0.02%, Te : 0.01%, individual content of other impurity elements ≤0.05%, total content of other impurity elements ≤0.15%, and the balance is Al.

[0027] (2) Production method:

[0028] (1) Smelting: Put aluminum ingots with a purity of 99.75% or more into the melting furnace, weigh the alloy elements according to the ratio and put them in the furnace, and then smelt them at a temperature of 720°C. During the smelting process, use electromagnetic stirring to accelerate the smelting speed , and use a slag removal truck to remove slag from the molten aluminum, and the molten aluminum stays in the smelting furnace for 8 hours;

[0029] (2) Degassing and slag removal: the smelted aluminum alloy melt is refined in the furnace and online degassing and slag removal; the online degassing uses argon as the covering gas to prevent secondary...

Embodiment 2

[0036] (1) Raw material and weight:

[0037]Its chemical composition is: Si: 9.5%, Mg: 1.5%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.20%, Sr: 0.1%, Bi: 0.1%, Te : 0.1%, individual content of other impurity elements ≤0.05%, total content of other impurity elements ≤0.15%, and the balance is Al.

[0038] (2) Production method:

[0039] (1) Melting: put aluminum ingots with a purity of 99.75% or more into the melting furnace, weigh the alloy elements according to the ratio and put them in the furnace, and then melt them at a temperature of 740°C. During the melting process, electromagnetic stirring is used to accelerate the melting speed , and use a slag removal truck to remove slag from the molten aluminum, and the molten aluminum stays in the smelting furnace for 7.5 hours;

[0040] (2) Degassing and slag removal: the smelted aluminum alloy melt is refined in the furnace and online degassing and slag removal; the online degassing uses argon as the covering gas to prevent secondary o...

Embodiment 3

[0047] (1) Raw material and weight:

[0048] Its chemical composition is: Si: 10.0%, Mg: 1.8%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.20%, Sr: 0.15%, Bi: 1.0%, Te : 0.5%, the single content of other impurity elements ≤0.05%, the total content of other impurity elements ≤0.15%, and the balance is Al.

[0049] (2) Production method:

[0050] (1) Melting: put aluminum ingots with a purity of 99.75% or more into the melting furnace, weigh the alloy elements according to the ratio and put them in the furnace, and then melt them at a temperature of 760 ° C. During the melting process, electromagnetic stirring is used to accelerate the melting speed , and use a slag removal truck to remove slag from the molten aluminum, and the molten aluminum stays in the smelting furnace for 7 hours;

[0051] (2) Degassing and slag removal: the smelted aluminum alloy melt is refined in the furnace and online degassing and slag removal; the online degassing uses argon as the covering gas to prevent seco...

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Abstract

The invention relates to a 4004 aluminum alloy containing bismuth and tellurium for brazing and a production method of the 4004 aluminum alloy. The 4004 aluminum alloy is characterized by comprising the following chemical components in percentage by mass: 9.0-10.5% of Si, 1.0-2.0% of Mg, smaller than or equal to 0.8% of Fe, smaller than or equal to 0.25% of Cu, smaller than or equal to 0.1% of Mn, smaller than or equal to 0.20% of Zn, 0.02-0.2% of Sr, 0.02-2.0% of Bi, 0.01-1.0% of Te, smaller than or equal to 0.05% of single content of other impurity elements, smaller than or equal to 0.15% of total content of other impurity elements and the balance of Al. The production method of the aluminum alloy is smelted, degassed, deslagged, cast, distressed and sawed; trace elements Bi and Te are added; the surface tension of the 4004 alloy is reduced; the liquidity and wettability of the 4004 alloy during brazing are improved; the reject ratio of a welding joint is reduced; the occurrence rate of welding leakage points is reduced.

Description

technical field [0001] The invention relates to the processing field of an aluminum alloy, in particular to a 4004 aluminum alloy containing bismuth and tellurium for brazing and a production method thereof. Background technique [0002] As a kind of Al-Si alloy, 4004 is often rolled together with 3003 aluminum alloy to form aluminum alloy composite materials. 4004 is used as a cladding layer, and the cladding layer melts during vacuum brazing to play a role in brazing. Aluminum alloy composite materials are widely used in radiators or heat exchangers of automobiles, air conditioners, oxygen generators and cryogenic equipment. Especially for large-scale heat exchangers used in air separation equipment such as oxygen generators, they need to work under a certain pressure, and the quality requirements for the heat exchangers are more stringent, which requires the brazing quality of the heat exchangers during vacuum brazing put forward higher requirements. At present, the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02B23K35/28
Inventor 莫肇月黄相博朱玉涛龙旭初刘莹
Owner 广西南南铝加工有限公司
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