B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 41/00 (2006.01) B21J 5/08 (2006.01) B21K 21/12 (2006.01)
Patent
CA 2079639
METHOD OF INTERNALLY AND EXTERNALLY UPSETTING THE END OF A METAL TUBE Abstract of the Disclosure A method is disclosed of externally and internally upsetting the end of a steel tube to provide a thicker wall for welding to a tool joint and for providing an internal tapered section having a projected length (Miu) along the longitudinal axis of the tube that substantially exceeds today's API standard upset. The method includes three upsetting steps, one pressing step, and one reheating step after the first two steps of the method.
Chunn William G.
Moore Ralph T.
Finlayson & Singlehurst
Prideco Inc.
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