TPT November 2011

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November 2011 47 ›
Technology Update
Dr. Linsinger-Str. 24, A-4662 Steyrermuehl
Tel. +43 7613 88 40, Fax +43 7613 88 40-951
E-Mail: w w w. l i n s i n g e r . c o m
ONE longitudinal tube mill ERW –
TWO High-Quality LINSINGER machines
Strip edge milling machine
BFMK for welding edge
preparation with highest
accuracy
Travelling tube cut-off
machine Multi-cut for very
short cutting times
Both machines
are adapted
on the
line speed
Tube-and-Pipe_180x125_180811.indd 1 19.09.11 11:24
Purge gas
and time
saving
solution
WHEN purging stainless steel or other
reactive metals, a well-purged oxygen-
free environment is crucial to ensure
a clean, strong weld that is free of
oxidation and has a uniform and smooth
internal weld profile.
The original, patented design of the
Ring Purge, available from Weldwide
Solutions Limited, enables the fabricator
to seal the inflatable dam inside the pipe
and achieve a purge around the weld
within a few minutes, and will therefore
not only save purge gas but will also
shorten the time spent on purging.
Compared to consumable purge
products (eg purge paper) where a
new product will need to be purchased
for every weld, a Ring Purge system’s
initial purchase cost will soon be offset,
as it can be used for hundreds of welds
if used correctly.
For example, an 8" Ring Purge used
for 100 welds will cost just over £2.40
per weld; if used for 200 welds, this cost
will be halved.
Unlike purge paper or purge film
products, Ring Purge and inflatable
dams provide the welder with ways to
get purge gas in and out of the pipe,
even when the root weld pass has
been closed.
Ring Purge maintains a positive seal
of the dams with the pipe ID so that
the purge gas provides a pressure to
support the weld root.
Customers using the Ring Purge
in a correct operation have reported
500+ welds from their product. The
pre-set valve minimises the risk of over-
inflation and bursting of the product,
which further increases life span.
The Ring Purge should be considered
for purging lengths of straight pipes that
need welding, and if used carefully can
be considered to weld lobster back
welds and some elbows. For purging
of smaller diameter pipes and around
bends, Weldwide Solutions Limited
recommends the use of Proban cotton
inflatable purge systems.
All of Weldwide Solutions’ inflatable
purge dam designs feature a secondary
purge gas inlet feed so that higher
flow rates of argon can be used when
making the initial root pass.
Using the secondary hose prevents
over-inflation of the dams, and if
flow rates become too high and the
welder feels too much gas pressure
escaping through the root gap, the
gas pressure will drop immediately
when the gas flow to the secondary
argon hose is reduced.
Weldwide Solutions Limited – UK
Fax: +44 1554 754 276
Email:
Website: