Abstract: The 2219 aluminum alloy was prepared by tungsten inert gas welding (TIG) additive manufacturing with non-pulse, weak pulse and strong pulse alternating currents, and the effect of pulse current intensity on the microstructure and tensile properties of the aluminum alloy was studied. The results show that the microstructures of the aluminum alloy specimens fabricated by non-pulse, weak pulse and strong pulse TIG additive manufacturing were the same, mainly consisting of matrix phase α(Al) and second phase θ(Al₂Cu), and the central region of the accumulation body was composed of equiaxed crystal. Compared with that under non-pulse current, the grain size of the specimens under weak pulse and strong pulse currents was smaller and more uniform. The aluminum alloy specimens fabricated by non-pulse, weak pulse and strong pulse TIG additive manufacturing all showed weak texture, and the maximum density was only 3.42. The pulse current intensity had no obvious effect on the grain orientation. After T6 heat treatment, compared to those under non-pulse current, the tensile strength of the specimens prepared under strong pulse current in the scanning direction decreased, while in the additive direction increased, and the overall anisotropy was reduced.