This document investigates the effect of vibration on the mechanical properties of Duplex Stainless Steel (DSS) 2205 during Tungsten Inert Gas (TIG) welding. Nine experimental welds were conducted using parameters of welding current, torch tilt angle, and vibration motor speed based on Taguchi's design of experiments. Tensile strength and hardness were evaluated for each weld. Results showed that applying vibration during welding increased tensile strength and hardness compared to welding without vibration. The optimal parameters were a welding current of 80 amps, torch tilt angle of 90 degrees, and vibration motor speed of 1500 RPM, which produced a weld with the highest tensile strength of 855 MPa. In conclusion,