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1. (WO2004007135) FORGE WELDING OF HEAVY DUTY TUBULARS

Pub. No.:    WO/2004/007135    International Application No.:    PCT/EP2003/007790
Publication Date: Jan 22, 2004 International Filing Date: Jul 17, 2003
IPC: B23K 13/00
B23K 13/02
B23K 13/04
B23K 13/06
B23K 20/00
B23K 20/02
B23K 20/14
B23K 33/00
Applicants: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
SHELL CANADA LIMITED
DEN BOER, Johannis, Josephus
COLE, Anthony, Thomas
DIMITRIADIS, Klisthenis
ZIJSLING, Djurre, Hans
Inventors: DEN BOER, Johannis, Josephus
COLE, Anthony, Thomas
DIMITRIADIS, Klisthenis
ZIJSLING, Djurre, Hans
Title: FORGE WELDING OF HEAVY DUTY TUBULARS
Abstract:
A method of joining heavy duty oilfield, well, or other tubulars comprises joining the tubulars by forge welding and flushing a reducing flushing gas around the heated tubular ends during at least part of the forge welding operation such that oxides are removed from the forge welded tubular ends and the amount of oxide inclusions and irregularities between the forge welded tubular ends is limited. The tubular ends may have a teethed or non-planar shape to inhibit any abrupt variations of the wall strength in the welding area and/or to reduce shear forces to the forge weld when the tubulars are twisted and/or radially expanded.