Method and apparatus for welding pipes together

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 37/06 (2006.01) B23K 9/00 (2006.01) C21D 9/50 (2006.01)

Patent

CA 2421847

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 said 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 (9) move along the circumferential joint (7) and are operated simultaneously to weld the pipes together. The pipes (5, 6) are made of TMCP--AC steel (steel manufactured using a thermal mechanical control process with accelerated cooling and having a carbon content of less than 0.1% by weight). 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).

La présente invention concerne un procédé qui permet d'installer un pipeline (6) sous l'eau, selon lequel on maintient une extrémité de pipeline (6), on obtient une section de tuyau (5) destinée à étendre le pipeline précité (6), on place ladite section de pipeline (5) adjacente à l'extrémité du pipeline (6) de manière que l'on définit un joint circulaire (7) à souder, et on soude les pipelines (5,6) ensemble. Une pluralité de chalumeaux soudeurs (9) se déplacent le long du joint circulaire (7) et sont manoeuvrés simultanément afin de souder les pipelines ensemble. Les pipelines (5,6) sont réalisés dans un acier TMCP-AC (un acier fabriqué selon un processus de régulation thermomécanique à refroidissement accéléré et possédant une teneur en carbone inférieure à 0,1 % en poids). Une fois la racine de la soudure formée, un rouleau de refroidissement (1) monté sur un crampon de serrage interne à l'intérieur des tuyaux (5,6) pulvérise un liquide de refroidissement, par exemple un jet d'eau atomisée (10) et d'air, depuis des buses (2) sur la surface intérieure des tuyaux (5,6) dans la région du joint circulaire (7) afin de refroidir les tuyaux (5,6).

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