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This paper is focused on the study and the control of a process of robotic arc welding. The system developed has been used to study the whole process and to develop an automatic controller for the arc process of deposition. The process consists of a shaped metal deposition (SMD) system that is an innovative method for the manufacturing of metal objects, which uses a layer-by-layer deposition technique. A useful software interface has been implemented in a Labview environment to study the system and to develop and tune the parameters of an automatic controller.