FIELD: mechanical engineering; welding. SUBSTANCE: invention relates to connection of sheet materials with current-conducting coating by seam welding. In process of welding thickness of coating before welding zone is measured. Welding current source is adjusted to provide constant power in welding zone depending on thickness of coating. Welder has coating thickness measuring device. Control or regulating element serves to form output signal generate control signal for regulation of welding current. EFFECT: improved quality of welds at welding of tin plate. 8 cl, 3 dwg
