Photographic and filming techniques have opened different study fields in all welding area and have been extensively employed to assess characteristics such as micro-constituents, phases, structures, metal transfer, gas flow, macro-etches, distortion and geometric measurements in workpieces. Despite this fundamental use in welding, constant mistakes and misuses of these techniques have been noticed, as positioning error, calibration, sensor selection, and type of image. Therefore, it is aimed here to address criteria required during measurements from pictures/films in welding. The main details are discussed in a practical form, so the user can benefit from the full potential of the technique. It is expected that the presented discussion contributes to the better and correct use of pictures/films from different welding processes. The authors also expect comments and suggestions to improve and bring this fundamental and important issue to the spotlight of the Revista Soldagem & Inspeção.
Metrology; Vision System; Compensation
