WALTER SCHNORRER

There are many situations in the welding
of stainless steels or other special metals
where introducing Schnorrer gas purge
equipment to the welding procedure can
improve weld quality and provide very
valuable cost reductions and savings in
job time and argon gas consumption.
There are often several methods by which
to try and achieve a purged welding
environment, and one essential feature of
any method is that it always produces the
critical low level of oxygen specified for
the material. The purge tool used must be
robust and must purge efficiently every
time, regardless of variables, e.g. the
welding position or the presence of pipe
elbows and bends.
The figures below compare the costs of
using a Walter Schnorrer® purge tool and
foam plugs when welding pipes.
The Walter Schnorrer® gas purge systems
are designed so that a gas flow
rate in litres/minute of 10% of the pipe
diameter (mm), produces a purge time
of only 1½-2½ minutes. It is expected
that when welding 20” pipe, the cost of
the purge tool will be recovered over 15-
20 butt welds. When using foam plugs
the purge time is different for each pipe
dimension.
There are many requirements of a purge
tool if it is to be a truly efficient and
economical method of eliminating oxygen
from the welding environment.
Requirements of a purge tool:
• Short and defined purge time to
extremely low oxygen level
• Consistent gas flow
• Quick and easy to assemble and
dismantle
• Minimum of shares
• Minimum use of tools
• Time and argon gas savings
• Able to withstand high temperatures
• UV-resistant
• Several methods of fixing
• Flexible in use (any pipepart and pipe
fitting)
• Efficient and fast gas diffuser
• Usable in all welding positions
• Ability to pull or shoot (with compressed
air) the tool through pipe lengths
• Suitable for all welding processes (MIG/
MAG, TIG and Plasma welding)
• Robust and with long life
In this catalog we present our wide
range of standard and proven products
for the purge of weld assembly.