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J

anuary

2011

61

T

echnology

U

pdate

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

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

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

Email:

info@polysoude.com

Website:

www.polysoude.com

Plasma process: seam welder

for vessel longitudinal seams

Seam welding: TIG, plasma or both?