A method of and a welding station for laying a pipeline, with pipe section welded together by internal and external welding

摘要

A method of laying a pipeline is described in which both internal and external weld passes are performed in order to weld together the pipe sections (2a, 2b). The method includes arranging a pipe section (2b) adjacent to the end (2a) of a pipeline thereby defining a circumferential joint (8) to be welded, performing an external weld pass, with for example GMAW - MIG torches (10), on the root (4r) of the joint (8) to be welded during which weld material is deposited in the root (4r) of the joint (8) to be welded, thereby forming a root weld (4r), and then performing an internal weld pass, with for example a GTAW - TIG torch (12), on the root weld (4r) during which the root weld (4r) is melted and re-shaped. The method has particular application in relation to pipes clad with corrosion resistant alloy (CRA) (6).