The topic of this thesys is the analysis of the application of Synchro-feed MIG/MAG welding process. In the theoretical part it is briefly said something about the history of welding in the world and in Croatia, then some basic concepts such as weldability and electric arc are explained. The following explains the welding parameters and their impact on the welded joint, it is said something about the methods of metal transfer, shielding gases for welding and necessary equipment for MIG/MAG welding is briefly described. After that, something was said about the Synchro-feed welding process itself, what makes it different from classical welding, and the method of performance is described. In the practical part, several different welded joints were made using the MAG welding process and after that same joints were made with Synchro-feed process. The goal was to get welded joints made with Synchro-feed as similar as possible to welded joints made with MAG by changing parameters of Synchro-feed process. After the joints were welded, they were cut and sanded in order to get an insight into the macrostructure. After that, the dimensions of the welded joints were measured using image and photo processing program, and their comparison was made. Also, the used welding equipment, basic and additional material, and the course of the process itself are described.