Rolled or extruded products for welded constructions made of AlMgMn type aluminum alloy. These products contain, in % by weight, 3.0Mg5.0, 0.75Mn1.0, Fe0.25, Si0.25, 0.02Zn0.40, optionally one or more of the elements Cr, Cu, Ti, Zr such that Cr0.25, Cu0.20, Ti0.20, Zr0.20, other elements 0.05 each and 0.15 in total, wherein Mn+2Zn0.75. In the welded state, these products have improved mechanical strength and resistance to fatigue without unfavorable consequences with regard to toughness and corrosion resistance, and are particularly suitable for naval construction, for industrial vehicles and for bicycle frames made of welded tubes.