Four-layered NiTi samples were deposited by wire arc additive manufacturing (WAAM) on titanium substrate, both under or without the ultrasonic (US) assistance. It was shown that US assistance during WAAM decreased the length of dendrites more than ten times. The US assistance during WAAM decreased the volume fraction of the Ti2Ni phase from 64 to 40 % in bottom layers and from 30 to 13 % in top layers due to a decrease in substrate volume that remelted during deposition of the first layer. The B2 ↔ B19’ transformation occurred in two stages when the sample was deposited without US assistance and it occurs in a single stage when US assistance was applied to the substrate. This effect was attributed to the homogenization of the NiTi phase composition induced by US assistance during WAAM. The deposition of the sample by WAAM under US assistance significantly decreased the sample texture.