This final student work consists of two parts. The first part will be a general part that talks about the method of testing welded joints by non-destructive methods (NDT method). In this first theoretical part, the methods of non-destructive testing of welded joints will be listed and explained in more detail. The devices with which the measurement and the control itself are performed will also be listed and explained. In addition to the NDT method, there is also the DT method, the basic difference between these two methods will be described. What are the advantages of one, and the disadvantages of the other method, and which method is most often used in welding facilities. The norm related to the NDT method was also mentioned. The second part of the final work is based on experimental work in the university laboratory. In that part, welding of welded joints was performed by non - destructive methods (NDT method). The results and procedures are presented, as well as the conclusions obtained by measuring and controlling the dimensions of welded joints.