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Brazing flux-free brazed aluminum alloy composite strip and manufacturing method thereof

A technology for composite strips and manufacturing methods, applied in the direction of manufacturing tools, welding/cutting media/materials, welding media, etc., to achieve the effects of high brazing strength, cost reduction, and uniform and fine brazing structure

Inactive Publication Date: 2021-02-09
JIANGSU ALCHA ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a kind of flux-free brazing aluminum alloy composite strip and its manufacturing method, which can solve the above-mentioned problems existing in existing flux-free brazing materials, and promote the development of flux-free brazing materials and technology. development of

Method used

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  • Brazing flux-free brazed aluminum alloy composite strip and manufacturing method thereof
  • Brazing flux-free brazed aluminum alloy composite strip and manufacturing method thereof
  • Brazing flux-free brazed aluminum alloy composite strip and manufacturing method thereof

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Embodiment 1

[0028] The invention discloses a flux-free brazing aluminum alloy composite strip, which comprises a core layer and a brazing layer, the brazing layer is arranged on both sides of the core layer, and the thickness of the brazing layer on each side is 10% of the total thickness of the composite strip.

[0029] Wherein, the core layer includes the following components in weight percentage: 0.35% Fe, 0.75% Si, 0.50% Mn, 0.30% Mg, 0.10% Zn, 0.25% Cu, 0.12% Ti, and the single content of other elements ≤ 0.05%, the total amount of other elements ≤ 0.15%, and the rest is Al.

[0030] The brazing layer does not contain flux and is an aluminum-silicon alloy. The aluminum-silicon alloy includes the following components in weight percentage: 0.15% Fe, 7.8% Si, 0.01% Cu, 0.01% Mn, 0.01% Mg, Sr 0.001%, Ti 0.05%, individual content of other elements ≤0.05%, and the balance is Al.

[0031] The method for manufacturing the above-mentioned flux-free brazing aluminum alloy composite strip com...

Embodiment 2

[0046] The invention discloses a flux-free brazing aluminum alloy composite strip, which comprises a core layer and a brazing layer, the brazing layer is arranged on both sides of the core layer, and the thickness of the brazing layer on each side is 5% of the total thickness of the composite strip.

[0047] Wherein, the core layer includes the following components in weight percentage: 0.45% Fe, 0.85% Si, 0.60% Mn, 0.40% Mg, 0.05% Zn, 0.35% Cu, 0.24% Ti, and the single content of other elements ≤ 0.05%, the total amount of other elements ≤ 0.15%, and the rest is Al.

[0048] The brazing layer is an aluminum-silicon alloy, and the aluminum-silicon alloy includes the following components in weight percentage: Fe 0.1%, Si 8.2%, Cu 0.05%, Mn 0.05%, Mg 0.005%, Sr 0.001%, Ti 0.01%, the individual content of other elements is ≤0.05%, and the balance is Al.

[0049] The preparation method and processing conditions are the same as in Example 1.

[0050] The flux-free brazing alumin...

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Abstract

The invention discloses a brazing flux-free brazed aluminum alloy composite strip and a manufacturing method thereof. The brazing flux-free brazed aluminum alloy composite strip comprises a core layerand brazing layers, wherein the brazing layers are arranged on the two sides of the core layer. The brazing layers are made of aluminum-silicon alloy, and the aluminum-silicon alloy is prepared from,in percent by weight: smaller than or equal to 0.25% of Fe, 7.8-8.2% of Si, smaller than or equal to 0.05% of Cu, smaller than or equal to 0.05% of Mn, smaller than or equal to 0.01% of Mg, smaller than or equal to 0.001% of Sr, smaller than or equal to 0.05% of Ti, smaller than or equal to 0.05% of each of other elements and the balance Al. Alloy components and structures are controlled throughformula adjustment and ingot casting procedures, then the rolling procedure is conducted, the composite strip has excellent and stable mechanical properties, the tensile strength and yield strength ofthe prepared finished strip are high, the brazing structure is uniform and fine, and the brazing strength is high; and brazing flux is not contained, the brazing performance is stable, the brazing quality is good, the service life of a heat transfer material is prolonged, the production efficiency is improved, and therefore the cost is reduced.

Description

technical field [0001] The invention relates to the field of manufacturing aluminum alloy materials, in particular to a flux-free brazing aluminum alloy composite strip and a manufacturing method thereof. Background technique [0002] The development of the heat transfer industry requires the manufacture of high quality materials and components at the lowest possible final cost. The most commonly used brazing production of heat exchangers is in an atmosphere of nitrogen with as little oxygen impurities as possible. This process is called controlled atmosphere brazing. In addition, it also contains Al-K-F based flux. By adding brazing flux, the brazing flux can be decomposed and dissolved to remove the oxide film to form wetting and melting to achieve the purpose of brazing. However, post-brazing flux residues are detrimental to heat exchangers as they may disperse on the brazed aluminum surfaces or clog internal channels, preventing efficient heat exchange in the heat excha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/02B23K35/28B23K35/40B23P15/00C22C21/02
CPCB23K35/0227B23K35/286B23K35/40B23P15/00C22C21/02
Inventor 张全成吴永新钱敏科陈惠新
Owner JIANGSU ALCHA ALUMINUM CO LTD
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