Method and apparatus for welding pipes together

Details Method and apparatus for welding pipes together Method and apparatus for welding pipes together

2006-10-03

2006-10-03

Singh, Sunil (Department: 3673)

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Submerging, raising, or manipulating line of pipe or cable...

C405S169000

Reexamination Certificate

active

07114881

ABSTRACT:
A method of laying a pipeline (6) underwater includes the steps of holding an end of a pipeline (6), providing a pipe section (5) for extending the pipeline (6), arranging the pipe section (5) adjacent to the end of pipeline (6) thereby defining a circumferential joint (7) to be welded, and welding the pipes (5, 6) together. A plurality of welding torches (8) move along the circumferential joint (7) and are operated simultaneously to weld the pipes together. The pipes (5, 6) are made of TMCP-SC steel. After the root weld is laid, a cooling ring (1) mounted on an internal clamp inside the pipes (5, 6) sprays cooling liquid, for example a fluid spray of atomised water (10) and air, from nozzles (2) onto an interior surface of the pipes (5, 6) in the region of the circumferential joint (7), thereby cooling the pipes (5, 6).

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N. Fukuhara et al., “Development of a High-Speed Automatic Welding Process for Simultaneous Use on Inside and Outside Surfaces of Pipes”, Welding International 1997, pp. 578-584.

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