TPT January 2011

T echnology U pdate

Seam welding: TIG, plasma or both?

with plasma/cold-wire process, and the filler and cap pass with the hot-wire TIG process. Depending on material and material thickness, welding speeds reach between 60 and 250mm per minute. Polysoude SAS – France Fax: +33 2 4068 1188

consist of low-alloyed or austenitic steel. Their length ranges between 1,000 and 3,000mm, in diameters between 800 and 1,500mm, and wall thicknesses between 5 and 40mm. For components with butt weld preparation and wall thicknesses up to 8mm, plasma welding with cold wire is the right choice. For greater wall thicknesses, the procedure combination takes effect: the root is welded

IN the fabrication of components for nuclear power plants, safety is the first priority. Safety is guaranteed by using high quality materials, complex production processes and the highest quality standards. In this industry, as in any other, production costs are of particular importance. Polysoude, France, has tailored a welding solution for a Russian supplier of pressure-vessels to bring in line the required productivity and security. The manufacturer of pressure-vessels has an export ratio of 80 per cent, and attaches great importance to short delivery schedules. A joining system was drafted, made using standard mechanised components, offering the optimal welding technique, and the optimal procedure combination for any wall thickness, for any diameter and for any material type. The system uses either the plasma or TIG-welding process, or both combined. With large diameters there is a choice to either weld from the outside to the inside, or vice versa. An integrated camera allows the visual control of the welding process. The sections

Email: info@polysoude.com Website: www.polysoude.com

Plasma process: seam welder for vessel longitudinal seams

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J anuary 2011

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