Butt Joint Between Two Pipe Segments of Sheet Metal and Process for Manufacture Thereof

A process for joining two pipe sections (10) of sheet metal with circular or oval cross sections, said process comprising:

• (a) sliding a pipe piece over the outer side of a pipe section (10), so that the pipe piece forms on the outer side of the pipe section (10) a reinforcing ring (47) lying flush against the pipe section (10),
• (b) bending said one end of pipe section (10) and the end of the reinforcing ring lying thereupon, from the pipe wall (12) outwards, to form a projecting ring rim (14) in the pipe section (10) and to form a flank (44) in the reinforcing ring (47), the flank (44) of the reinforcing ring (47) lying against at least the radially inner part of the projecting ring rim (14), thereby forming a flange end,
• (c) placing said flange end of said pipe section (10) against a flange end of another pipe section, and
• (d) connecting said flange ends (32) by a tensioning device for holding the pipe sections together in the axial direction.

A process for joining two pipe sections (10) of sheet metal with circular or oval cross sections, said process comprising:

• (a) sliding a pipe piece over the outer side of a pipe section (10) until an axaial segment (24) of the end of the pipe section (10) is exposed, and so that the pipe piece forms on the outer side of the pipe section (10) a reinforcing ring (47) lying flush against the pipe section (10),
• (b) bending said exposed axial segment (24) of pipe section (10) outwards, forming in the pipe section (10) a bent end,
• (c) bending the bent end of pipe section (10) and the end of the reinforcing ring lying thereupon, from the pipe wall (12) outwards, to form a projecting ring rim (14) in the pipe section (10) and a clamp flank (44) in the reinforcing ring (47), thereby forming a flange end, whereby the bent exposed axial segment (24) of pipe section (10) forms a clamp flank reinforcing flank (48),
• (d) placing said flange end of said pipe section (10) against a flange end of another pipe section, and
• (e) connecting said flange ends (32) by a tensioning device for holding the pipe sections together in the axial direction.