WELDING APPARATUS, SUBMERGED PIPELINE AND METHOD FOR MOUNTING IT Russian patent published in 2004 - IPC

FIELD: welding processes and equipment, namely for submerged pipelines.

SUBSTANCE: apparatus includes unit for fastening equipment with central port for tube sections; group of welding head mounted on said unit and arranged along circle; guiding assembly for welding heads mounted with possibility of fastening around tube section. Said assembly includes guide for each welding head around tube section. Unit for fastening equipment has sectors and it is mounted with possibility of rotation, mainly around vertical axis. Each welding head is joined with respective sector of unit for fastening equipment; said unit is mounted with possibility of rotation of respective sector around tube section at rotation of welding head joined with given sector around tube section. At welding upper part of pipeline is arranged in central port of unit for fastening equipment that supports group of welding heads mounted along circle. Lower part of tube section is placed onto upper part of pipeline. Welding is realized on (arranged along circle) joining portions of lower part of tube section and upper part of pipeline at simultaneously using more than one welding head and providing their simultaneous motion around joining portion.

EFFECT: improved design allowing due to rotation of unit for fastening equipment to decrease or fully eliminate change of position of each welding head relative to said unit.

28 cl, 9 dwg