This master thesis addresses the impact of parameters in the MIG/MAG welding process on the geometrical properties of the workpiece in the context of additive manufacturing. The work consists of both theoretical and experimental parts. The theoretical section, based on data from the referenced literature, describes the additive manufacturing process using MIG/MAG welding technology. A brief introduction provides an overview of additive manufacturing and its characteristics. The thesis defines metal additive manufacturing and presents the classification of metal additive manufacturing processes. The main part of the theoretical section focuses on Wire Arc Additive Manufacturing (WAAM), providing examples of metals that can be used as feedstock for WAAM. The characteristics of the process, including parameters, advantages, and disadvantages, are discussed. The applications of products made using this technology are also outlined, and the WAAM process is compared with conventional manufacturing technologies as well as other additive technologies. In the experimental part of the master thesis, two samples were produced using an automated MIG process and stainless steel welding wire, with varying process parameters. The geometrical characteristics of the surface, specifically the topography of the examined surfaces, were analyzed. Based on the results, conclusions were drawn on how different welding parameters affect the geometrical properties of the produced samples and which parameters are more suitable for the fabrication of stainless steel structures.