The central topic of this work was to investigate and subsequently implement the maintenance of forging dies made of hot-work steel using welding processes by industrial robots. This study started with the acquisition of theoretical basics. First the general manufacturing and repair of dies was investigated, following by an examination of the suitability of various welding processes with focus on the CMT process. Finally, the kinematics and programming methods of industrial robots for these purposes were analysed. The practical part started with testing of welding parameters for the selected filler metal. Several welding parameters were inspected and then examined by light microscopy. The best parameters were then selected for further trials. Next, the welding cell used during the work was simulated in an offline programming software for industrial robots. In addition, the provided postprocessor of the program was revised, thus it could be used for the industrial robot of the forming institute including the two external axes of a tilt-turn table. The 3D printing function of the software was then used to produce tensile specimens. These were then tested and the stress/strain curve analyzed. This not only served to examine the material properties of the filler metal, but also to understand and evaluate the 3D printing function of the software. Finally, two dies provided by companies were repaired using an additive maintenance procedure. The difference between the target state and the actual state of the die was then determined by 3D mapping of the damaged die. The missing areas of the damaged die were then welded to the die using additive methods. The dies were then heat treated and the repair method analysed.