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High strength long-life aluminium tube material with high sagging resistance

A technology of aluminum plate and aluminum alloy, applied in the field of aluminum alloy, can solve problems such as difficulty in welding of alloy CAB, and achieve the effect of eliminating defects

Active Publication Date: 2005-11-02
SAPA HEAT TRANSFER AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high Mg content, the reaction between Mg and flux makes CAB welding of this alloy difficult

Method used

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  • High strength long-life aluminium tube material with high sagging resistance
  • High strength long-life aluminium tube material with high sagging resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Droop distance

[0039] Four alloys designed with high Mn materials given in reference I US6019939. An alloy was prepared with the same composition as the reference except higher Cu (Reference II). Two different types of alloys according to the invention were prepared, Mg-free (A) and Mg-containing (B). The alloy composition is shown in Table 2.

[0040] Cut the test block into a rectangle and fix it with a free arm of 80mm as a cantilever beam. The free position of the end of the beam is measured before and after the simulated welding, and the distance between the two positions is used to define the sag distance below. The vacuum soldering process included heating from room temperature to 600°C in 45 minutes, holding at this temperature for 10 minutes, and natural cooling in air from ~550°C.

[0041] From the test results in Table 3, high Cu content in the alloy cannot substantially improve the sag resistance, as described in US6019939. Apparently, the p...

Embodiment 2

[0046] Example 2 Effect of Mn content on strength

[0047] Four alloys were designed using the high Mn material composition of US6019939 as reference. An alloy was prepared otherwise identical to the reference, but with high Zr (ref III). Alloys according to the present invention are prepared in two different types, Mg-free (A) and Mg-containing (B). The composition of the alloy is shown in Table 4. Samples are taken when the material has reached a suitable thickness for the pipe and is H24 tempered.

[0048] The material is subjected to welding simulations in a vacuum and cut to length suitable for tensile testing. The vacuum welding process consisted of heating from room temperature to 600°C in 45 minutes, holding at this temperature for 5 minutes, and natural cooling in air from ~550°C. Only air cooled samples (~1°C / s) were used.

[0049] The results of the tensile test are shown in Table 5. Mn increased from 1.5 to 1.7% by weight, and the strength increased. The str...

Embodiment 3

[0054] Example 3 Effect of Mg content on yield strength.

[0055] According to Table 6, two alloy compositions containing Mg (A) and Mg (B) in the present invention were compared. The plate of the material is subjected to a pressure of about 10 -4 Simulated welding was carried out in Torr's vacuum furnace according to the following welding procedure, heating from room temperature to 600°C in 45 minutes, followed by holding at this temperature for 5 minutes before the specimen was cooled to room temperature in air.

[0056] As shown in Table 7, Mg is beneficial to the strength and increases the yield strength by 7 MPa.

[0057] Table 6: Chemical composition (weight %), melt analysis

[0058] sample

Si

Fe

Cu

mn

Mg

Zr

A

0.06

0.16

0.79

1.72

＜0.01

0.12

B

0.06

0.16

0.81

1.72

0.31

0.13

[0059] ...

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Abstract

An aluminum alloy, a clad or unclad material for a brazed product containing the alloy as a core, and a method for producing the material, wherein the material is used for manufacturing the brazed product from the alloy.

Description

field of invention [0001] The present invention is generally in the field of aluminum alloys and relates to a clad or unclad material for welding products comprising said alloy as a core. The invention also relates to a method of producing said material, wherein said material is used to produce welded products from said alloy. Background of the invention [0002] At present, the pipe material commonly used by heat exchanger manufacturers is the standard AA3003, or the so-called long-life 3005 alloy. These are also the most commonly used materials in production processes including controlled atmosphere welding methods (CAB). Long-life 3005 alloy is a standard AA3005 alloy, which is produced by a special process to improve the corrosion resistance of the material, and can be used for heat exchangers, etc. [0003] However, at present, the mechanical strength of this material cannot meet the requirements of heat exchanger manufacturers, because today's heat exchanger manufact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04
CPCC22F1/04F28F21/08B32B15/016C22C21/00
Inventor H-E·埃尔斯罗姆S·瓦斯R·韦斯特高A·奥萨卡尔森A·莫贝里
Owner SAPA HEAT TRANSFER AB
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