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US 6,444,059 B1Granted
Product for a welded construction made of AlMgMn alloy having improved mechanical strength
AssigneePechiney Rhenalu
InventorsGuy-Michel Raynaud, Jean-Luc Hoffmann, Laurent Cottignies, Georges Pillet
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Abstract
Rolled or extruded products for welded constructions are made of an aluminum-magnesium-manganese type aluminum alloy, consisting essentially of, by weight: 3.0<Mg<5.0 0.5<Mn<1.0 Fe<0.25 Si<0.25 Zn<0.40 Cr<0.25 Cu<0.20 Ti<0.20 Zr<0.20 The product has a volumetric fraction of Mn containing dispersoids grater than 1.2%.
Claims13
A welded construction comprising first and second sections made of AlMgMn aluminum alloy welded together to form a joint having a hardness >80 Hv, said alloy consisting essentially of (% by weight):
- 4.3<Mg<5.0
- 0.5<Mn<1.0
- Fe<0.20
- Si<0.25
- Zn<0.40
- Cr<0.25
- Cu<0.20
- Ti<0.20
- Zr<0.20
- wherein Mn+2Zn>0.75,
- each of said sections having been formed by casting, homogenizing, hot rolling and optionally cold rolling,
- wherein the welded joint, when prepared by continuous automatic MIG butt welding with a symmetrical bevel having an inclination of 45° to vertical over a thickness of 4 mm and with filler wire of 5183 alloy, determined by a tensile test on standardized DNV test pieces having a length of 140 mm and a width of 35 mm, a center weld bead with a width of 15 mm, and a length of a narrow portion which is the sum of bead width and twice section thickness, has a yield stress Rm greater than 300 MPa.
9 more elements
Dependencies are inferred from the claim text.