SEMIAUTOMATIC SYSTEM FOR DIFFUSION WELDING OF TUBULAR BLANKS Russian patent published in 2002 - IPC

FIELD: welding technique, namely apparatuses for diffusion welding in vacuum. SUBSTANCE: system includes heater mounted on lateral wall of chamber in such a way that its lower end is placed higher than height of welded blanks arranged in accumulating face chuck. Drive unit with rod is arranged under chamber in such a way that rod enters in vacuum chamber to level until upper end of heater. Two annular stoppers are arranged coaxially relative to rod over heater. Roller type expanding tool is arranged coaxially relative to said stoppers over them; expanding tool has drive whose changeable rollers are arranged inside stationary ring. Annular stoppers are arranged on suspended flange secured to end portions of columns placed at inner side onto lid of chamber. Accumulating face chuck has uniformly arranged along circle changeable seats with central opening for passing powered rod; said seats are designed for placing blanks. Movable sleeve is mounted on traverse bar moving at least between two columns by action of powered rod and compression springs fit onto said columns. Changeable rollers of expanding tool are mounted on end portions of freely rotatable tie rods. Powered rod may have mechanic or hydraulic drive. EFFECT: possibility for making welded tubular joints in wide size range. 6 cl, 4 dwg