Abstract: A multi-layer single-pass wall arc additive experiment was conducted using ER2594 super duplex stainless steel wire with a diameter of 1.2 mm. BaF as an activator was introduced in a coated form during the additive process. The microstructure and mechanical properties of the additive components in both the build direction and deposition direction were analyzed. The results indicate that the addition of BaF as an activator during the arc additive eliminates columnar grains in the microstructure, thereby reducing the heterogeneity in the distribution of the microstructure along the build and deposition directions, which achieves a homogenization of the microstructure in the arc-additive super duplex stainless steel. The method also significantly reduces the anisotropy in material hardness and tensile properties.