In this diploma paper we deal with the conceptual idea and elaboration of automation of the process of welding nuts on previously cold-pressed products, in order to improve and modernize the production process of the company KM-Kovnica d.o.o. KM-Kovnica is known as the largest Croatian factory for the production of metal parts for the automotive industry and other high-tech industries. The company, which was founded in 2013. and is a part of the KÖNIG METALL Group, which has decades of experience in the production of metal parts and metal processing. The purpose of this paper is to present a solution for robotization and modernization of the production process in the welding department, more precisely one of its segments dealing with welding of nuts by electric resistance projection welding, which is currently performed entirely by hand on a total of ten machines. The main goal of this automation is to achieve a high level of quality of the final product, aswell as to achieve uniform quality, then modernization and reduction of the number of workers needed in this physically and mentally demanding jobs. The software package for the preperation of technical documentation and 3D modeling SolidWorks 2017 was used to model the necessary parts and elements of the robotic station. The software package RoboDK was used to simulate the plant and analyze the cycle. The station, its elements and the robot itself are controlled by a PLC in combination with a HMI user interface programmed within Siemens' Tia Portal v15.1 software package, while communication between the PLC and the robotic station itself, since it is a simulation environment, is executed and programmed within Python. As part of the robotic station itself, there is an integrated station for visual inspection of the welded parts, where the previously welded piece is recorded with a camera, and the correctness of the performed procedure is checked. The mentioned vision inspection was also performed in the Python programming language.