B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 37/08 (2006.01) B21B 17/14 (2006.01)
Patent
CA 2731337
Continuous coil tubing made from shorter lengths of flat metal strip which are spliced end-to end and formed into tubular form and seam welded and thereafter introduced into a forging or hot reduction process. Finished coil tubing is withdrawn from the process at a faster rate than flat metal strip is fed into the process. Welds made to the flat metal strip blend into and substantially disappear from the finished coil tubing.
Dubois Jon D.
Fetherstonhaugh & Co.
LandOfFree
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