Page 106 - Soudage

Welding automation

Engineering, Arc welding

Welding solutions for Pipemills Problem-free flux and wire feed systems
We offer the smooth feeding of wire in different diameters and
ESAB is a complete, reliable partner for pipemill welding. Not the equally straightforward supply of new and re-used flux.
only do we have in-depth experience of demanding multi-wire The constant and reliable wire feed is secured by high torque
submerged-arc welding. We also have a comprehensive range wire feed motors and enclosed double wire straightening
of products for this type of production. mounted in 90 degrees to each other.
The correct combination of compressed air, flux feeding, easy
Flexible, reliable welding equipment replenishment aof new flux via the Big/Bag system, a vacuum
We have a wide range of products developed in house for vari- unit, a reliable magnetic separator and continuous recovery
ous multi-wire SAW applications which are particularly suitable helps to create welding stations with less downtime, high-quality
for pipe welding. The range includes AC-DC power sources in welds and, last but not least, a cleaner working environment.
the Pipemill Edition, controls for multi-wire processes including
documentation, as well as columns and booms with a wide vari- Spiral pipe welding
ety of welding heads. Many end users require spiral-welded pipes for different pur-
poses, such as water pipes. Normally, the wall thickness is lim-
Precise, high-speed longitudinal welding ited to 25 mm, but the diameter range can be up to roughly 2.5
Our concept for longitudinal submerged-arc welding is suitable m. As in longitudinal pipe welding solutions, an internal welding
for pipes in a normal diameter range of 20-64", a normal wall head mounted on a long boom and an outside head mounted on
thickness of 6 to 40 mm and a length of up to 18 m. a column and boom are used for offline spiral pipe welding.
However, this is the only similarity.
Internal and external welding First of all, internal and external welding is performed at one and
For internal welding we have designed pre-stressed booms as the same station. Internal welding starts first and, after half a
well as welding heads for up to four wires. During internal weld- turn, external welding then begins – internally with two or in
ing, front-mounted laser sensor guides the welding head via the some cases three wires and externally with one or three wires in
cross-slide. Video camera observation of accurate guiding and the welding process, depending on the diameter and wall thick-
the welding process is standard. ness of the pipe.
The external welding station is based on a column and boom
solution with a very stable cross-slide to adapt to different pipe Ordering information
diameters. The actual welding head, with its up to five-wire feed For more information, please contact your nearest ESAB repre-
systems mounted on a so-called "rainbow fixture", is based on sentative.
the ESAB A6S-Arc Master System which has been tested more
than 10.000 times.

Return current systems (Grounding)
High current circuits have to be closed back to the power source
by efficient systems at constantly moving pipes. Flexible steel
brushes in two rows in front and behind the welding process are
pressed with defined force from outside to the pipe to catch the
current with a minimum of Voltage loss and to surely avoid any
arc blow effect, which would disturb the weld process.

104