ARGWELD®
QUICK PURGE - PIPE
PURGING SYSTEMS
In cases where purging is required to be fast as well as The spinal connection hose is shorter than with other devices,
reliable, the Quick Purge Systems can be used. to keep the purged volume to a minimum. The majority of the
volume between the two dams, is filled with a special heat
These systems will typically purge 36” pipe diameters to below resisting collar, to keep the purge time low.
0.1% oxygen in less than 10 minutes and all smaller pipes,
correspondingly faster.
After positioning the system the argon source is opened, the
Description dams inflated to size and the interspace purged.
Each Quick Purge system is covered with heat protective
material on the inside, so that the high temperatures at close After a few seconds, the auxilliary purge line can be opened
proximity to the weld do not damage the devices. to ensure the fastest possible purge time.
Three hoses are available, one for argon inflation and purge,
In trials these devices have performed many high speed welds
the second for auxilliary purge and the third for gas exhaust
under these conditions.
via a purge monitor.
Operation
The system is connected to an argon hose and inserted into
the pipe to be welded.
Typical installation of a standard inflatble
purge system.
1 The Argweld® Quick Purge Purging System is positioned
using thepull tags. (a)
= Pipe work inside the sleeve
= Valve
= Exhaust
(a)
= Exhaust / Inlet
(a)
2 The Purging System is inflated using the inert gas
supply. (b)
Air out Air
(b) Argon in
24” QUICK PURGE SYSTEM
Argon
(c)
3 Once the Purging System is inflated and seals in the pipe,
the pressure opens the purge valve (c), the air space
is purged by the inert gas, displacing the air between
the dams to the outside (d) via the exhausts. Until the
oxygen level is low enough to begin welding.
Argon out Argon
Argon in
(d) (d)
Argon
(c)
Note: Outside of the weld joint will normally be taped
when the joint design is not closed
4 During welding the flow rate of inert gas should be
maintained to purge any oxygen released by the
increasing temperature.
ARGWELD® PURGE MONITOR MK V
5 When the weld is completed and allowed to cool below Before welding can begin using an inert gas, it is essential
oxidation temperature, the purge gas can be shut off, to know that the oxygen content at the weld area has been
the system will deflate and then can be removed. reduced to a satisfactory low level.
The Argweld® Purge Monitor MKV is specifically designed
to measure oxygen content down to 0.01% with a high
degree of accuracy. An oxygen content of below 0.1%
loops
is normally considered suitable to ensure that there is
loops
no oxidation of the weld, although there may be some
exceptions to this when welding materials such as titanium
and zirconium.
Another perfect pipe weld!
Don't use “make do” devices as they contain a lot of
water, water vapour and air, puts your weld at risk and
end up costing you more money.
Use the proper tool for the job!
We also supply a wide range of other products for pipe
fabrication and welding. Ask for details about:
• Trailing Shields
• Backing Tape
• Flexible Enclosures
• Nylon Purge Plugs
• Water Soluble Purge Film
• Tungsten Electrode Grinders TEG-3
• Multi-Strike™ Tungsten Electrodes
(ACA01 LT AQP GE 04/02/2005)
Huntingdon Fusion Techniques Limited, Stukeley Meadow, Burry Port, Carms SA16 0BU United Kingdom
Telephone: +44 (0) 1554 836 836 Facsimile: +44 (0) 1554 836 837 Email: hft@huntingdonfusion.com http://www.huntingdonfusion.com
Copyright © 2001-2004 All rights reserved. This publication may not be reproduced by any means without the written permission of Huntingdon Fusion Techniques
