Pipes and tubular conduits – Longitudinally seamed – Permanent type seam
Patent
1989-05-04
1990-06-05
Bryant, III, James E.
Pipes and tubular conduits
Longitudinally seamed
Permanent type seam
138128, 138103, 138118, 138177, 138178, 21914522, F16L 904
Patent
active
049305476
ABSTRACT:
A powder-filled welded steel tube has a tube wall with a welded longitudinal seam and is wound into a coil for despatch. To reduce the risk that the seam opens when the tube is twisted, e.g. on uncoiling, the tube wall is provided with a continuous longitudinal groove. Preferably the groove is symmetrical and directed radially inwards. In the continuous manufacture of such tube, a metal strip is formed into an open channel, powder is introduced into the channel, the channel is closed and the edges welded to form a closed tube. The diameter is then reduced and the finished product is coiled. The longitudinal groove is rolled in continuously during the diameter reduction of the powder-filled welded tube.
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Bryant III James E.
Rijnstaal B.V.
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