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36 May 2016
T E CHNOLOG Y
 EXCELLENT QUALITY
 INNOVATION
 EXPERI ENCE FOR MORE THAN 100 YEARS
 GLOBAL NETWORK
 FOR THE BEST RESULTS IN CUTTING
 ANY SIZE OF BLADE FOR ALL MACHINES
MADE IN JAPAN
since 1910
TCT-CIRCULAR SAW BLADES FOR CUTTING BAR/TUBE/PIPE
TENRYU SAW MFG. CO., LTD. | Japan, Fukuroi,
TENRYU EUROPE GMBH | Germany, Aalen,
TENRYU AMERICA INC. | USA, Hebron KY,
TENRYU SAW DE MEXICO, S.A. DE C.V. | México, Silao, Guanajuato,
TENRYU (CHINA) SAW MFG. CO., LTD. | P.R. of China, Langfang, Hebei,
TENRYU SAW (THAILAND) CO., LTD. | Thail., Amiphur P., Rayong,
TENRYU SAW INDIA PVT. LTD. | India, Neemrama, Rajasthan,
. . . ASK TENRYU !
Water-soluble film for pipe purging
WHEN tubes and pipes of certain
materials, such as stainless steel,
titanium, copper-nickel and zirconium,
are welded together it is desirable to
purge the oxygen out of the inside of
the weld zone to prevent it from reacting
with the hot metal and causing oxidation,
porosity, discolouration and loss of
corrosion resistance.
Products for purging the insides of
pipes include inflatable tube and pipe
purging systems, such as PurgElite®,
QuickPurge® and HotPurge®. However,
it is not always practical to use such
systems for one-off work on just a few
joints of one particular size, for closing
welds, for ‘T’ piece joints or for a number
of other branch type joints.
to overcome this difficulty, Huntingdon
Fusion Techniques (HFT) provides
Argweld® Weld Purge Film™ kits, with
water-soluble materials that can be used
for open assemblies and closing welds.
the film produces an impenetrable
purge barrier that can easily be washed
away when hydrostatically testing the
pipe or just by flushing out.
To obtain a quality purge it has been
customary to fill pipes with expensive
argon gas and keep the gas running
at what is thought to be a suitable flow
rate for an estimated period of time.
in today’s climate of ever-improving
quality control and increasing demands
on procedures with traceability, it is
inappropriate to use such methods to
ensure a satisfactory purge. It is not
desirable to simply pour gas into a pipe
assembly in the hope that a good purge
and, ultimately, a good weld will be
achieved. This technique often does not
work and is unnecessarily expensive.
LukeKeane, distributor support forHFT,
said, “It is so easy to cut a circle of water
soluble film and place it a short distance
away from the root gap before welding,
pasting in place with the argweld Water-
Soluble Super Adhesive™ to ensure
a tough, leak-tight barrier, keeping the
purging volume to the barest minimum.”
Argweld Weld Purge Film may save
operators costs by minimising gas usage
and reducing the time taken to make a
purge, while achieving a desirably low
oxygen level. after welding, the water-
soluble film is simply washed away
during the standard hydrotest cycle or
by flushing the pipe interior. the film is
dissolved, leaving no trace.
Huntingdon Fusion Techniques – UK
Email:
Website:
HFT’s Argweld water-soluble film
and adhesive