Patent ID: 7073826

Claim:
A butt joint between two pipe sections ( 10 ) of sheet metal with circular or oval cross sections, which respectively exhibit on one end a connecting flange ( 32 ), formed as one piece with the adjacent pipe wall ( 12 ), for production of the butt joint with an adjacent pipe section ( 10 ), wherein each connecting flange includes at least one ring rim ( 14 ) projecting outwards from the pipe wall ( 12 ) and wherein the connecting flanges ( 32 ) are held together by a tensioning device ( 34 ) for holding the pipe sections ( 10 ) together in the axial direction, wherein a one-piece reinforcing ring ( 47 ) of sheet metal lies against the outer side of the end of each pipe section ( 10 ) and against at least a radial inner part of each ring rim ( 14 ), and wherein each connecting flange ( 32 ) includes a clamp flank ( 24 ) deflected from an outer end of the ring rim ( 14 ) conically towards the adjacent pipe wall ( 12 ), and wherein the tensioning device ( 34 ) is a clamping ring seated upon the connecting flanges ( 32 ) with conical side flanks ( 38 ) lying against the clamp flanks ( 24 ) of the connecting flanges ( 32 ).