PRODUCT FOR OBTAINING WELDED AlMgMn ALLOY STRUCTURES WITH IMPROVED MECHANICAL RESISTANCE

摘要

Laminated or extruded products for obtaining welded AlMgMn-type aluminium alloy structures are described, said products having the following contents in weight percent: 3.0 < Mg < 5.0; 0.75 < Mn < 1.0; Fe < 0.25; Si < 0.25; Zn < 0.40; optionally, one or more components selected from Cr, Cu, Ti, Zr, such that: Cr < 0.25; Cu < 0.20; Ti < 0.20; Zr < 0.20; other components < 0.05 each and < 0.15 in all, wherein Mn + 2Zn > 0.75. The welded products have improved mechanical and fatigue resistance, while retaining their toughness and corrosion resistance, and are particularly suitable for applications in shipbuilding, utility vehicles and bicycle frames made of welded tubes.