Welding of Vacuum Tubing and Piping


Welds in tubing and pipework for vacuum systems should have many important characteristics. They ideally need to be manufactured from stainless steel, leak tight, the joints should have full penetration with excellent sidewall fusion, there should be no porosity and the finish should be free from oxidation and discolouration.

When welding these stainless steel tubes and pipes, it is important to purge the welding zone with an inert gas, usually argon, to prevent loss of corrosion resistance, oxidation, discolouration, metallurgical defects and to ensure a good internal weld profile.

After 40 years of innovation, design and manufacturing expertise in the field of tube and pipe weld purging, Huntingdon Fusion Techniques HFT® has introduced PurgElite®, a range of low cost Tube and Pipe Purging Systems to achieve a clean, oxide free, zero colour weld in such tubes and pipes. As well as vacuum tube and piping, PurgElite® can be used in any other industry where stainless steel or titanium is used.

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No Lost Purge During Welding


Weld Purging stainless steel and exotic metal pipes before, during and after welding is necessary and welders often construct their own purging device made from wood, foam or paper.

These unsuitable dams may leak or slip from position, flooding the welding zone with oxygen and resulting in an unsuccessful weld. The alternative to the homemade devices is to fill the entire pipes with expensive argon gas for the duration of the weld.

Weld Purging Experts Huntingdon Fusion Techniques HFT® have designed and developed Argweld® Weld Purge Film® kits to address these issues, ensuring weld purging is not only affordable, but also successful.

The Water Soluble Weld Purge Film® can also be used for open assemblies and closing welds, producing an impenetrable purge barrier.


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Pipe Plugging and Blocking of all shapes and sizes with Pipestoppers®

01W-PipestoppersPlugsStoppersPipe plugs and stoppers are in use globally for a large variety of applications. This includes leak testing, weld purging, debris stopping and pipe freezing for repair or maintenance work for thousands of different industries.

Manufacturing a wide range of plugs and stoppers of up to two meters in diameter, Huntingdon Fusion Techniques HFT®’s Pipestoppers® Division will ensure that whatever your application, they have the solution.

Ron Sewell, Chairman for HFT® said: "There are thousands of applications our Pipestoppers® can support for so many industries.

Some of these include: Construction of refineries and similar large oil and gas related plants, where plugs are required to block open ended pipework with leak tight seal. Construction of factories and housing for plugs used to test leak tightness of foul water systems.”

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Launch of New Weld Purge Monitors® at Fabtech 2016

03W-PurgEye200-WeldPurgeMonitorWeld Purging Experts Huntingdon Fusion Techniques HFT® will have a major presence at Fabtech 2016 and will be displaying their entire range of weld purging products.

Georgia Gascoyne, CEO for HFT® said: “Fabtech 2016 will be the launch platform to demonstrate our updated range of PurgEye® Weld Purge Monitors®. We will be exhibiting at the show with our US Partner COB Industries and we are very excited to show the industry what innovative updates we have made to remain at the forefront of weld purging technology. Come and see us on Booth N7322.”

“All our new Weld Purge Monitors® will be available to view at the show, as well as the world famous PurgEye® 100.”

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Countdown to Fabtech, Las Vegas, USA

PurgEye 200 1000 NewLAS VEGAS - come and see us at the FABTECH from 16 to 18 November 2016

You will be delighted to see the innovative changes and updates to our very popular range of PurgEye® Weld Purge Monitors®.  

Las Vegas, the centre of excitement surrounding the show, the FabTech location for 2016 is a perfect place for us to present new updates to the PurgEye® 200, PurgEye® 1000 Remote and the PurgEye® Site, all with new PurgeNet capabilities.

Once again, we are attending with COB Industries, our US Partner and we are very excited to show the industry what advanced updates we have made to remain at the forefront of Weld Purging Technology.

Come along and visit us on Booth N7322.

If you would like to schedule a private demonstration or a time to discuss any unique Weld Purging challenges we can help you solve, then This email address is being protected from spambots. You need JavaScript enabled to view it..

All of our Weld Purge Monitors® and Inflatable Pipe Purging Systems are manufactured with scientific knowledge with extensive background research. We pride ourselves in quality. You can be sure to achieve perfect welds, time and timeand time again.

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Huntingdon Fusion Techniques HFT® are proud members of the American Welding Society and The Welding Institute.

Weld Purge your Pipes the “Elite” Way

06W-PurgEliteWeldPurgeSystemsWhen welding or tack welding stainless, duplex, chrome steel and titanium tubes and pipes, it is important to purge the welding zone with an inert gas to prevent corrosion, oxidation, discolouration and to ensure a good internal weld profile with no metallurgical defects.

After more than 40 years of innovation, design and manufacturing expertise in the field of tube and pipe weld purging, Huntingdon Fusion Techniques HFT® has introduced PurgElite®, a range of low cost Tube and Pipe Purging Systems to achieve a clean, oxide free, zero colour weld.

Georgia Gascoyne, CEO for HFT® said: “We recently had a customer who was wasting a lot of money in time and argon gas costs by filling entire pipework fabrications with argon in order to weld the stainless steel pipes in an inert environment.There were several 90º bends in the pipework, so the customer thought filling the whole pipework system was the only option.”

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Upcoming Events

lasvegas900Here are some upcoming events within the industry to add to your calendar.

ADIPEC, Abu Dhabi
7 – 10 November 2016
HFT® will be on the UK Pavilion, being managed by the EIC (Energy Industries Council)
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Stainless Steel Americas, Houston, USA
9 – 10 November 2016
Part of one of their Breakout Workshop Sessions, Georgia Gascoyne will be delivering a Presentation on Stainless Steel: Welding Reduces Corrosion Resistance (25 minutes)

FabTech, Las Vegas, USA (exhibiting with COB)
16 – 18 November 2016
Fabtech, USA will be the next trade show HFT® will be exhibiting at along with our US Partner COB Industries. The annual trade show celebrates the strength of metal forming, fabrication, welding and finishing and takes place this November. We are excited to announce that this years show will be the launch platform to demonstrate our new Argweld® Inflatable Tube, Pipe and Pipeline Weld Purging Systems and a heavily updated range of PurgEye® Weld Purge Monitors®.
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Keep checking our Blog for more information.

Switch to MultiStrike® for an improved and safer Tungsten Electrode performance

01W-MultiStrikesTungstenElectrodesTungsten Electrodes are used when arc welding with the GTAW/Tungsten Inert Gas (TIG) process or PAW/Plasma welding. Other than to start the process, it is necessary to grind tungsten electrodes after they have touched the molten weld pool or the filler rod to the tungsten, which is not only time consuming but can also be a hazard to health.

Recognising both the performance requirement and the risk to health posed by thoriated tungsten electrodes, Huntingdon Fusion Techniques HFT®’s MultiStrike® Tungsten Electrodes not only deliver an increased performance, they also reduce the risk to health.

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Fast Purging of Heat Treated Pipework

05W-HotPurgePreHeatedPipeworkPurgeSystemsHigh strength steel joints, such as those used in the power industry for high-pressure pipework, need to be pre-heated for welding and also require a post weld heat treatment.

Weld joints of this nature are often purged of oxygen and welded in an inert atmosphere for various reasons, one of which is to reduce the risk of ‘sugaring’, an imperfection that could allow metal pieces to break off inside pipework and cause damage to turbines.

With the high temperatures and length of time at such temperatures, most weld purging systems are unsuitable. HotPurge® has been developed by International Weld Purging Specialists Huntingdon Fusion Techniques HFT®, an Inflatable Pipe Purging System for Heat Treated Chrome and High Strength Stainless Steel Pipe Joints where the temperatures might be as high as 760ºC (1,400ºF) for many hours.

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Introducing Super Heavy Duty Weld Backing Tape™

Weld Backing TapeMany weld joints require a controlled underbead profile of the first root pass. Uneven root profiles can cause product entrapment that may contaminate a process as well as interrupting flow characteristics.

Where manual welding cannot control the weld root profile sufficiently well, or when an automatic weld process is unable to reach satisfactory speeds while still obtaining satisfactory underbeads, it is common to use a method of backing below the weld. A cost effective way to provide support for molten metal below a weld joint, is to use Argweld® Weld Backing Tape™.

Weld Purging Experts Huntingdon Fusion Techniques HFT® have recently developed a super heavy duty Weld Backing Tape™, which provides the support to produce perfect weld underbeads when welding with currents of up to 600 Amps.

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Freeze Sealing for Pipe Repairs with Qwik-Freezer™

06W-Qwik-Freeze-Pipe-FreezingFreeze sealing pipes for repair or maintenance is an increasingly popular alternative to ‘hot-tapping’ and eliminates the need to shut or drain down a system for repairs and maintenance. These systems work by creating ice plugs (or ‘freeze seals’) upstream of the repair site or on either side of an area where a pipe system needs to be maintained.

The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® provides Qwik-Freezer™, the industry standard portable CO2 Pipe Freezing System. With thousands of kits in use around the world, Qwik-Freezer™ covers pipe diameters from 3/8” – 8” (9 – 200 mm).

Qwik-Freezer™ is quick and easy to use, requires little set-up time and is the only CO2 Pipe Freezing System capable of freezing up to 8” pipe. Even for smaller diameter freezes, Qwik-Freezer™ produces ice plugs that are significantly more reliable and robust, capable of withstanding far more pressure than the smaller plugs that other types of systems will produce.

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Pipe Welding becomes Easier

06W-InflatableWeldPurgeDamsNew devices for welding stainless, duplex, chrome steels and titanium are launched by Huntingdon Fusion Techniques HFT®.

Typically for closure welds, tight bends, T piece joints and dome end connections where a conventional Tandem Weld Purging System cannot be used, a range of low cost, single ended Inflatable Weld Purge Dams is available for pipe diameters from 6 to 96 inches (150 mm up to 2,440 mm).

These lightweight systems are easy to inflate and are heat resistant up to 90oC (194oF).

Ron Sewell, Chairman at Huntingdon Fusion Techniques HFT® said: “Even today, many companies are still allowing their technicians to spend many hours fabricating dams made of foam, cardboard, adhesive tape, wood and so on. Like paper, these materials contain a high percentage of water, which is very undesirable to have in the presence of a weld.

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