FIELD: metallurgy.
SUBSTANCE: invention may be used in production of welded structures of aluminum alloys via friction stir welding, in particular for connecting sheets of Al-Mg system alloys. The alloy sheet crude products are produced through intensive plastic deformation within the temperature range of 150-450°C that provides at least 50% of volume fraction of recrystallized grains with a size of less than 10 microns. Sothermal rolling is then carried out within the temperature range of 150-450°C with a total degree of deformation at least 40% and subsequent mechanical working of the sheet welded edges. Friction stir welding is made. The combination of pre-thermomechanical processing and the following welding ensures uniformity of the sheet welded crude products structure.
EFFECT: production of preforms with the same grain size both in the base material and the weld zone ensures high crack resistane of the compound.
3 cl, 2 dwg, 1 tbl, 2 ex
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