FIELD: metallurgy, more particularly constructional material as additive material. SUBSTANCE: alloy comprises, wt.%, magnesium, 5.5-6.5; zirconium, 0.02-0.15; scandium, 0.2-0.3; beryllium, 0.0001-0.005; boron, 0.001-0.01; manganese, 0.5-0.7; lanthanum, 0.01-0.02 and aluminium, the balance, and ΣSc+La = 0,3-0,4. Alloy has rather high plasticity and use of said alloy as additive material permit eliminating defects such as cracks and pores in weld joint and increasing strength and impact strength of said alloy. EFFECT: improved properties of the aluminium-based alloy. 1 ex, 2 tbl
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