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Formable, high strength aluminium-magnesium alloy material for application in welded structures

a technology of aluminium-magnesium alloy and welded structure, which is applied in the direction of welding/cutting media/materials, manufacturing tools, and solvents, etc., can solve the problems of limited use of this alloy, difficult alloy manufacturing, and limited strength before and after

Inactive Publication Date: 2003-08-07
HASZLER ALFRED JOHANN PETER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of this alloy is limited to applications which require service temperatures below 80.degree. C.
Unfortunately, the achievable strength before and after welding is less than that of the AA5083 alloy.
Mg levels below 3.0% do not provide the required weld strength and when the addition exceeds 5.0%, the manufacturing of the alloy is difficult.
Mn levels below 0.4% cannot provide sufficient strength to the welded joints of the alloy.
Above 1.2% the casting becomes more difficult.
Zr levels above 0.25% tend to result in very coarse needle-shaped primary particles which decrease ease of fabrication of the alloys and formability of the alloy rolled products or extrusions, and therefore the Zr level must be not more than 0.25%.
However, Cr limits the solubility of Mn and Zr.
However, Ti in combination with Zr forms undesirable coarse primaries.
Fe: Fe forms Al--Fe--Mn compounds during casting, thereby limiting the beneficial effects due to Mn.
If the treatment is carried out below 350.degree. C., the resultant homogenisation effect is inadequate.
If the temperature is above 580.degree. C., eutectic melting might occur resulting in undesirable pore formation.

Method used

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Examples

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Embodiment Construction

[0048] On a laboratory scale of testing seven alloy have been cast, see Table 1. Alloys 1 to 3 are comparative examples, of which alloy 1 is within the AA5454 range and alloy 3 within the AA5083 range. Alloys 4 to 7 are all examples of the alloy in accordance with this invention.

[0049] The cast ingots have been homogenised for 14 hours at 510.degree. C., then hot rolled from 80 mm down to 3 mm. Then cold rolled from 3 to 2 mm and interannealed, and subsequently cold rolled down the final gauge of 1.2 mm. The cold rolled sheets have been final annealed for 1 hour at 350.degree. C., using a heat-up and cool down rate of 30.degree. C. / h.

[0050] The materials obtained have been tested at room temperature of its mechanical properties in both the L- and TL-direction, see Table 2. It is known that within experimental errors the tensile test results of O-temper samples are indicative equivalent of strength in welded condition. Additionally the materials have been tested for their corrosion b...

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Abstract

Aluminium-magnesium alloy in the form of a rolled product or an extrusion, having the following composition in weight percent:

Description

[0001] The present invention relates to an aluminium-magnesium alloy with a Mg content of up to 4.5 wt. %, in the form of rolled products and extrusions, which are particularly suitable to be used in the form of sheets, plates or extrusions in the construction of welded or joined structures such as storage containers, pressure vessels and vessels for land and marine transportation. Rolled products may have a thickness in the range of a few mm, e.g., up to 200 mm. Extrusions of the alloy of this invention can be used for example in tubes for welded marine structures, and weld filler wire can be manufactured from the alloy of his invention.DESCRIPTION OF THE RELATED ART[0002] Aluminium-magnesium alloys with Mg levels in the range of 2.0 to 5.0 wt. % are extensively used in welded constructions such as storage containers, pressure vessels and vessels for land and marine transportation. A standard alloy of this type is the AA5083 alloy having the nominal composition, in wt. %:2 Mg 4.0-4...

Claims

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Application Information

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IPC IPC(8): B23K35/28C22C21/06
CPCC22C21/06B23K35/288
Inventor HASZLER, ALFRED JOHANN PETERSAMPATH, DESIKANBAEKELANDT, JEAN PIERRE JULESVAN DER HOEVEN, JOB ANTHONIUS
Owner HASZLER ALFRED JOHANN PETER
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