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US 7,741,580 B2Granted
Method of welding a pipe/connector joint
AssigneeNational Oilwell Varco, L.P.
InventorRichard Lyell Holdren
Life of this patent
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Abstract
A method for welding a pipe section and a connector, where each of the pipe and connector have inner and outer beveled surfaces forming only a single angular alignment land when mated. The pipe and connector are welded together with only a single interior welding pass and with more than one exterior welding pass to fill the weld joints at the outer beveled surface, so as to weld the connector to the pipe.
Claims18
A method for welding a pipe and a connector together at a weld joint comprising the steps of:
- forming only one inner beveled surface and only one outer beveled surface on an end of the pipe;
- forming only one outer beveled surface and only one inner beveled surface on an end of the connector,
- mating only the outer beveled surface of the pipe to only the inner beveled surface of the connector together such that the outer beveled surface of the pipe and the inner beveled surface of the connector are contacting along only a single tapered mating surface, to form an angular self-alignment land between interior and exterior portions of the weld joint between the pipe and the connector, and,
- performing only a single interior submerged arc welding pass to fill the interior portion of the weld joint with welding material, and,
- performing more than one exterior submerged arc welding pass to fill the exterior portion of the weld joint with welding material, thereby welding said pipe to said connector.
2 more elements
Dependencies are inferred from the claim text.