The aim of this paper and the illustrated analysis is to prove the cost-effectiveness of procurement of a machine that would automatize a part of manufacturing, and, by extension, increase efficiency, reduce labor costs, and improve the quality of the final product. To begin with, the paper describes the welding methods used in the manufacturing sites in detail, as well as the method performed by the robot. Currently, the MAG method is used for highest percentage of construction steel welding installation in all types of facilities, and other applications. The second part of this paper explains norms that apply to mechanization and automation of the welding process in detail. Considering that all business organizations involved in the manufacturing of this type are subject to the requirements of implementing the norms EN 1090 and HRN EN ISO 3834, this paper will elaborate on the final product quality requirements prescribed by the aforementioned norms. Finally, the last part of this thesis, draws a conclusion on the efficiency of implementation based on the experimental part, which is also divided into two subsections. The first subsection indicates the costs of manufacture with manual welding machines. In the second subsection, this thesis turns to the 3D simulation of welding application to all assembly parts previously performed manually, as well as to welding performed by a robot. By comparing the obtained results, this paper indicates the time period over which this investment would become profitable.