Pipe-joining method and apparatus for producing underwater pipelines, and underwater-pipeline-laying vessel comprising such an apparatus

摘要

A method of joining pipes (3) to produce an underwater pipeline (2) provides for rotating an extrusion outlet about a cutback (18) between two welded pipes (3) so as to wind and simultaneously extrude a protective sheet (22) about the cutback (18) from the extrusion outlet (38) close to and facing the cutback (18); and compressing the protective sheet (22) on the cutback (18) downstream from the extrusion outlet (38).