Claims
- 1. Aluminum alloy sheet for a welded construction, consisting essentially of, in % by weight:
3.0<Mg<5.0 0.5<Mn<1.0 0.02<Zn<0.40 Fe<0.25 Si<0.25 Cr<0.25 Cu<0.20 Ti<0.20 Zr<0.20 other elements <0.05 each and <0.15 total, remainder Al, wherein Mn+2Zn>0.75.
- 2. Sheet according to claim 1, wherein Mn+2Zn>0.8.
- 3. Sheet according to claim 1, wherein Cr<0.15.
- 4. Sheet according to claim 1, wherein Mg>4.3.
- 5. Sheet according to claim 4, wherein Mg>4.6.
- 6. Sheet according to claim 1, wherein 0.10≦Zn<0.40.
- 7. Sheet according to claim 1, wherein Mn>0.8.
- 8. Sheet according to claim 1, wherein Fe<0.20.
- 9. Sheet according to claim 8, wherein Fe<0.15.
- 10. Sheet according to claim 1, wherein dispersoids are present in a volumetric fraction greater than 1.2%.
- 11. Sheet according to claim 1, having a thickness >2.5 mm and obtained directly by hot rolling.
- 12. Sheet according to claim 1, having, in an unwelded state, fatigue resistance, measured by plane bending wherein R=0.1 in the cross-longitudinal direction, higher than:
105 cycles, with a maximum stress >280 MPa; 106 cycles with a maximum stress >220 MPa; 107 cycles with a maximum stress >200 MPa.
- 13. Sheet according to claim 1, having a fissure propagation rate ΔK, measured when R=0.1, higher than:
22 Mpa✓m when da/dn=5×10−4 mm/cycle; 26 Mpa✓m when da/dn=10−3 mm/cycle.
- 14. Sheet according to claim 1, welded by fusion to form a welded zone, and having a hardness >80 Hv in the welded zone.
- 15. Sheet according to claim 1, having a yield stress, measured on a standard DNV sample across an MIG butt welded joint, greater than 140 MPa.
- 16. Sheet according to claim 15, having a yield stress, measured on a standard DNV sample across an MIG butt welded joint, greater than 150 MPa.
Priority Claims (2)
Number |
Date |
Country |
Kind |
95/02387 |
Feb 1995 |
FR |
|
95/12065 |
Oct 1995 |
FR |
|
Parent Case Info
[0001] This application is a continuation-in-part of U.S. application Ser. No. 08/875,113, filed Jul. 25, 1997, which was filed under 35 USC 371 on the basis of PCT/FR96/00279, filed Feb. 21, 1996.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08875113 |
Jul 1997 |
US |
Child |
10189176 |
Jul 2002 |
US |