FIELD: manufacture of aircrafts, missiles, in ship making and other industry branches. SUBSTANCE: method comprises steps of moving disc tool by rotating it around axis normal relative to plane of end faces of part edges while transferring material removed out of edges to zone behind moving tool; limiting volume of said zone by means of additional device for reducing material; immersing disc tool through slit of additional device to butt of joined parts. Welded seam has small width, smooth surface having no irregularities such as flaws and ridges. EFFECT: enhanced efficiency, high quality of welded seam. 1 dwg
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