<p>The as-built ER2209 duplex stainless steel parts were fabricated using plasma arc additive manufacturing (PAAM) under different interlayer dwell times. The as-built microstructure was examined by X-ray diffraction (XRD) and optical microscopy (OM). The mechanical properties and corrosion resistance of the samples were evaluated through tensile testing and electrochemical testing. Microstructural analysis revealed a composition of α-ferrite and γ-austenite phases, with anisotropy observed across different planes. Increasing the interlayer dwell time led to a increase in α-ferrite content and a refinement of the microstructure with reduced dendrite arm spacing. Consequently, the tensile strength increased, whereas the elongation and corrosion stability experienced a slight decrease. The X-Z plane (perpendicular to the build direction) samples showed higher tensile strength and lower ductility and corrosion resistance than the Y-Z plane (parallel to the build direction) samples. All tensile samples exhibited ductile fracture.</p>