Pipes and tubular conduits – Combined – With end structure
Patent
1978-03-16
1981-06-16
Lewis, Michael L.
Pipes and tubular conduits
Combined
With end structure
138142, 138155, 175325, 308 4A, 428685, 428932, F16L 904
Patent
active
042731593
ABSTRACT:
A box tool joint member of generally tubular configuration is adapted for securement by welding to one end of a steel tube to form a drill pipe. The box tool joint member comprises a body having a cylindrical outer periphery, an internally threaded socket at one end of the body, and a weld neck of smaller outer diameter than the body adjacent to the other end of the body. A tapered transition piece connecting the neck with the adjacent end of the body provides an elevator shoulder. A correlative pin tool joint member is welded to the opposite end of the tube to complete the drill pipe.
The box tool joint member has an annular band of hard facing over the outer periphery of the transition piece and extending down over the adjacent part of the weld neck and up around the adjacent part of the body. The hard facing is corrosion resistant and has a smooth finished surface. Underneath the hard facing and extending beyond both ends of the hard facing is an annular butter layer of non-hardenable steel. The tool joint member is hardened and tempered after the butter layer is welded into a body groove and before the hard facing is welded on .The butter layer is grooved before the hard facing is welded on.
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Translation of Offlegungsschrift No. 2551895 by Berlitz.
Murphy, J., ed.; Surface Preparation and Finishes For Metals McGraw Hill pp. 371-396, (1971).
Composite Catalog, vol. 2 World Oil, Houston Texas, pp. 3216-3219.
Composite Catalog vol 3; World Oil, Houston Texas pp. 4694-4695.
Metals Handbook vol. 6 8th Edition, American Society for Metals pp. 273-276, (1971).
Oberg, E. et al.; Machinery's Handbook Industrial Press, N.Y. New York, 15th edition pp. 290-293, (1956).
Bolton Jimmie B.
Crews Sam T.
Conley Ned L.
Lewis Michael L.
Robinson Murray
Rose David Alan
Smith International Inc.
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