Aluminium brazing sheet

A plate and brazing technology, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problem of waste disposal, etc., and achieve the effect of eliminating cost, good working environment and saving workshop space

Active Publication Date: 2012-07-11
SAPA HEAT TRANSFER AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi is considered an impurity in many cases and thus creates waste disposal issues during the manufacturing process
There is also hope for improving the brazing process

Method used

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  • Aluminium brazing sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0055] According to one embodiment, the chemical composition of the thin cladding material comprises

[0056] Bi 0.01-1.0 wt%, preferably 0.05-0.7 wt%, more preferably 0.07-0.5 wt%,

[0057] Mg≤0.05% by weight, preferably ≤0.01% by weight, more preferably 0%,

[0058] Mn≤1.0% by weight,

[0059] Cu≤1.2% by weight,

[0060] Fe≤1.0% by weight,

[0061] Si ≤ 1.9% by weight, preferably ≤ 1.65% by weight, more preferably ≤ 1.4% by weight, most preferably ≤ 0.9% by weight,

[0062] Ti≤0.1% by weight,

[0063] Zn≤6 wt%, Sn≤0.1 wt%, In≤0.1 wt%, and

[0064] Unavoidable impurities each contained less than 0.05% by weight, and the total impurity content was less than 0.2% by weight, with the balance being Al.

[0065] A Si content of 1.9 wt% or less in the thin cladding layer will help the cladding layer to be in a solid state when the solder layer melts, and thus also facilitate wettability and joint formation. Pure aluminum may contain up to 1.65% Si in solid solution at 577°C ...

Embodiment

[0073] All alloys were cast by laboratory casting equipment into so-called stack molds, which were produced into small slabs with a length of 150 mm, a width of 90 mm and a thickness of 20 mm. Table 1 shows the chemical composition of the alloys used to test brazeability.

[0074] Each slab was trimmed, heated from room temperature to 450°C over 8 hours, held at 450°C for 2 hours, and cooled in ambient air. The material is then rolled to the appropriate thickness, with soft annealing between steps when required for easier rolling. The core material-intermediate brazing layer-outer layer material is then combined into a three-layer clad pack, and the layers in the composite pack are brought into contact with each other by cold rolling. The material was cold rolled to a thickness of 0.4mm, this provided a single sided cladding with 8% middle layer and 2% outer layer with an intermediate softening anneal when required to provide easy rolling and give a final back anneal , so th...

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Abstract

A multi layered aluminium alloy brazing sheet consisting of: a core material that on either one or both sides has an intermediate layer consisting of an Al-Si braze alloy interposed between the core and a thin covering layer on top of the intermediate layer, where the said core material and the covering layer has a higher melting temperature than the Al-Si, braze alloy, the covering layer containing Bi 0.01 to 1.0 wt%, Mg <= 0.01 wt%, Mn <= 1.0 wt%, Cu = 1.2 wt%,Fe <= 1.0 wt%, Si <= 4.0 wt%,Ti <= 0.1 wt%, Zr, Cr, V and / or Sc in total <= 0.2%, and unavoidable impurities each in amounts less than 0.05 wt%, and a total impurity content of less than 0.2 wt%, the balance consisting of aluminium; and a heat exchanger comprising the alloy brazing sheet.

Description

technical field [0001] The present invention relates to an improved multilayer aluminum brazing sheet comprising a core material and an outer cladding layer clad with a brazing alloy as an intermediate layer. The invention also relates to a heat exchanger comprising said improved multilayer aluminum brazing sheet. Background technique [0002] The present invention relates to sheet materials for joining by brazing of aluminum materials in an inert or reducing atmosphere without the use of fluxes to rupture, dissolve or remove surface oxide layers. [0003] The current challenge is to manufacture materials and components for the heat exchanger industry at the lowest possible final cost and with the highest possible quality. One technique commonly used in heat exchanger manufacture is brazing in a controlled atmosphere usually consisting of nitrogen containing as little oxidizing impurities as possible. This method is known as controlled atmosphere brazing ("CAB"), and invol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/00B23K35/02B23K35/28B23K35/38B32B15/01C22C21/02F28F21/08
CPCB23K35/286C22C21/02F28F21/089B23K35/0238B23K35/383B23K35/002B32B15/016Y10T428/12764B23K1/0012B32B15/01F28F21/084
Inventor D·亚伯拉罕松R·韦斯特高T·斯滕奎斯特
Owner SAPA HEAT TRANSFER AB
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