INNER CENTRALIZER FOR ASSEMBLING AND VACUUM WELDING OF ANNULAR BUTTS OF TUBES Russian patent published in 2001 - IPC

FIELD: inner centralizers for assembling tubes for welding, mainly for welding in chambers with controlled atmosphere. SUBSTANCE: centralizer provides close (without gaps) abutting of ends of welded tubes in spite of their non-normality relative to axes of welded tubes because centralizer has flanges in the form of movable and stationary sleeves. Stationary sleeve has annular bead and it is secured to end of central rod. Annular elastic sealings in the form of ganged block of flat rings are mounted in outer surface of stationary sleeve with possibility of their deforming by means of one movable sleeve put on stationary sleeve, pipe placed on central rod and one of nuts. Second movable sleeve and second nut are mounted in opposite end of central rod. EFFECT: improved design. 5 cl, 3 dwg