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[References: 21 tit.]

X-ray diffraction analysis and transmission electron microscopy have shown the formation of a gradient structure in surface layers during electropulsing-assisted ultrasonic impact treatment (EAUIT) of a weld in Ti-6Al-4V alloy samples prepared by the electron-beam wire additive technology. In particular, nanocrystalline titanium and titanium-iron oxides, and amorphous and nanocrystalline α-phase structures form at a depth of 1-2 µm; a nanocrystalline structure in layers with β + α" and α + β-phases forms at a depth of 2 to 10 µm; and submicro and microcrystalline α-phase structures, at a depth of more than 10 µm. EAUIT of the metal in the weld zone causes iron alloying of 1-2 µm surface layers and increases the microhardness due to an increase in the grain boundary contribution to the hardening due to nanocrystalline and submicro and microcrystalline structure formation in α- and β-phases during processing and hardening due to the precipitation of nanocrystalline titanium-iron oxide and α"-phases.