Patent ID: 7494043

Claim:
A method for constructing a welded construction, comprising the steps of: (a) providing separate component parts of the construction having a composition comprising (in weight percent): Mg 4.9 to 6.0 Mn 0.6 to 1.2 Zn 0.25 to 1.5 Zr 0.05 to 0.25 Cr 0.3 max. Ti 0.2 max. Fe 0.5 max. Si 0.5 max. Cu 0.25 max. Sc 0.3 max., balance inevitable impurities and aluminium, and (b) welding the separate parts together with an Al—Mg—Mn weld filler alloy having a good corrosion resistance and improved strength levels, comprising the following composition (in weight percent): Mg 7.0-9.5 Mn 0.9-2.0 Zn 0.2-0.9 Zr ≦0.3 Cr ≦0.5 Sc ≦2.8 Cu ≦0.5 Fe ≦0.5 Si ≦0.5 Ti ≦0.3, the balance aluminium and incidental elements and impurities.