FIELD: process engineering.
SUBSTANCE: invention maybe used in production of heat exchangers composed of tube plates connected to tubes by friction welding. Friction consumable rod 2 of friction tool revolves and is displaced into open end of tube 11 along tube axis, said tube being surrounded by tube plate 10. Ring 3 arranged behind friction rod 2 features OD exceeding friction rod diameter and is furnished with bead 4 to make transition between said ring and said friction rod. Ring 3 is pressed against surfaces of tube end 12 and that of tube plate 10. Said surfaces are softened to produced weld seam there between. Ring bead 4 features, at least, one section acting on end of tube and tube plate being welded together. Said section may be concave if seen from friction rod side, or have semicircular, or rectangular, or triangular cross section.
EFFECT: high quality circular weld seam.
5 cl, 2 dwg
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