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Closure Welds Made Easy!

inflatable weld purging dams, purge bladder, weld purging, purge welding, inert gas weldingWeld Purging closure welds can be challenging, especially when using a tandem inflatable system to reduce the volume being purged. Often, the system becomes irretrievable and therefore other weld purging methods have to be used, to avoid unwanted products in the pipe.

The innovative Weld Purge Dams from Huntingdon Fusion Techniques HFT® help to avoid some problems faced by closing welds, T piece joints and dome end connections where a conventional Tandem Weld Purging System cannot be used. The single ended dams are ideal for welding stainless, duplex, chrome steels and titanium joints.

The single ended Inflatable Weld Purge Dams, available for pipe diameters from 6 to 88 inches (152 mm up to 2,235 mm) are made of low vapour pressure materials specially selected for optimum weld purging results to provide the lowest oxygen reading in the fastest possible time with the minimum use of expensive argon gas.

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Leak Testing, Debris Stopping and Weld Purging with Pipestoppers®

nylon plugs, weld purging, leak testing, aluminium plugs, steel plugsPipe plugs and stoppers are in use globally for a large variety of applications, including 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.”

“Boating, yachting and all marine businesses where holes are frequently there to be blocked and an endless supply of water trying to enter. Use in aircraft construction and repair of submarines. The list really is endless, from very high tech to very low tech applications.”

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Safer and More Efficient Welding with MultiStrike®

multistrike tungsten electrode, there free tungsten, green tungsten, blue tipped tungsten, huntingdon fusionMany welders today are still using 2% red-tipped thoriated Tungsten Electrodes, which contain radiotoxic thoria and therefore can be dangerous to health of those exposed to it, especially in the dust format from grinding the tips.

To overcome the accumulated hazardous thoria conditions, whilst maintaining a very high life expectancy for the Tungsten Electrode, Huntingdon Fusion Techniques HFT®’s blue-tipped MultiStrike® Tungsten Electrodes contain a mix of non-radioactive rare earth elements, eliminating the risk to health posed by radiotoxic thoriated Tungsten Electrodes.

A customer in the UK recently said: "The introduction of MultiStrike® has been welcomed by all our welding staff. The new Tungsten Electrodes are giving excellent results and demonstrating much improved strike characteristics. Their life is significantly longer which is expected to lead to long-term cost savings. We are also aware of the health and safety benefits of using non-thoriated electrodes." 

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Inflatable Pipe Purging Systems for Zero Colour Welds

purgelite, weld purging, back purging, oxygen purging, stainless steel weldingProducing zero colour tube and pipe welds when joining metals such as stainless, duplex and chrome steels, titanium and zirconium can be challenging and at times can prove costly. In many industries today the welding zone has to be purged of oxygen down as low as 100 ppm, or even lower in industries such as the Dairy Industry, where food and beverage products are passing through them.

The tubes and pipes must be free from oxidation and discolouration to produce metallurgically sound welds and prevent corrosion and in addition, be welded with a good internal profile to prevent entrapment.

It most cases, it is not cost effective to fill entire tubes and pipes with an inert gas before, during and after welding. To overcome these challenges, Weld Purging Experts Huntingdon Fusion Techniques HFT® has introduced PurgElite®, a range of low cost Tube and Pipe Purging Systems, designed to drastically reduce the purging zone, saving welders both time and wasted inert gas costs.

Luke Keane, Distributor Support for HFT® said: “To save welders the expense of completely filling tubes and pipes with an inert gas, PurgElite® Systems are available, manufactured to suit pipe diameters from 1” to 24” (25 to 600 mm). PurgElite® is manufactured with a special spinal tube that is resistant to hot metal up to 300ºC (572ºF) and is super flexible to allow movement around 180º bends if necessary. These spinal tubes are made of low outgassing rate materials, so there is no risk of weld contamination.”

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Block Pipes Instantly and Effectively with Low Profile Stoppers

inflatable stoppers, debris plugging, inflatable pipe bungs, inflatable pipe stoppers, pipe bungThere is a large number of pipe plugging and blocking requirements within a variety of industries such as Oil & Gas, Construction, Plumbing, Shipbuilding, Mining, Power etc., for duties such as repair work, leak testing, weld purging and debris stopping. One major concern being the entry of debris into pipes during operations.

The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® design and manufacture a range of Mechanical and Inflatable Pipestoppers® and Plugs to suit all applications. The Low Profile Stopper is available for applications where insufficient length of pipe is available for the regular Cylindrical or Spherical Stopper.

Ron Sewell, Chairman at HFT® said: “The Low Profile Stopper can fit into a pipe end that may be directly on an elbow or just inside a flanged neck on a casting. Other applications include blocking pipe ends to keep gases inside or to keep debris and vermin out.” 

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Low Cost Welding Accessories

weld trailing shields, inert gas coverage, back purging, weld purging Titanium, stainless steel and other corrosion resistant materials are used for tubing and pipework especially where there are highly corrosive materials flowing through them.

When such pipework is welded for joining or repairs, it is necessary to protect the material in and close to the weld joint, carried out by a technique called Weld Purging. Oxygen and nitrogen can be harmful to the weld joint in particular as they will combine very easily with the hot material, forming oxides and nitrides, until the temperature falls below its oxidation point.

One inexpensive accessory called a Weld Trailing Shield® can be added to a GTAW/TIG welding torch before beginning a pipe weld. This lightweight tool, designed and manufactured from Weld Purging Experts Huntingdon Fusion Techniques HFT®, is easily manoeuvred around the pipe joint as it is being welded, with no inconvenience to the welder.

The Trailing Shield® is connected to an argon gas source and when the weld is started, it has extra argon flooding to the sides of the weld and covering the heat affected zone adjacent to the weld. As the welding torch is moved forward, because of the length of the Trailing Shield®, the weld remains under an argon gas shield until the welded metal has cooled below its oxidation temperature. 

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Keep an ‘Eye’ on your Critical Welds

weld purge monitor, ppm trace, oxygen sniffer, purgeye desk, weld purgingWeld Purging is the act of removing oxygen from the vicinity of a weld before, during and after welding metals such as stainless steel, titanium, zirconium and nickel alloys. Without Weld Purging, the weld would be left oxidised and discoloured, which could then lead to loss of corrosion resistance and metallurgical imperfections.

In order to accurately read the residual oxygen level inside a tube, pipe, welding chamber or enclosure during the act of purging, Weld Purging Experts Huntingdon Fusion Techniques HFT® have designed a Family Range of Weld Purge Monitors to suit all applications and budgets. Their PurgEye® Desk launched this month, is ideal for use with Welding Chambers and Enclosures as well as Orbital Welding Machines and other Automatic Welding Systems.

Georgia Gascoyne, CEO for Huntingdon Fusion Techniques HFT® said: “The PurgEye® Desk replaces the old PurgEye® 500, but with new and innovative features. One huge addition is our revolutionary PurgeNet™, for the in-line connection of several accessories that allows the Weld Purge Monitor® to actually control welding systems based upon oxygen level.” 

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Improve Weld Root Profiles with Backing Tape®

weld backing, huntingdon fusion, weld purging, back purgingDuring the welding of tanks, chambers and vessels, an uneven root profile can cause product entrapment that may contaminate a process as well as interrupting flow characteristics. Many weld joints require a controlled underbead profile of the first root pass.

Where manual welding cannot control the weld root profile sufficiently, 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 Weld Backing Tape®.

Weld Purging Experts Huntingdon Fusion Techniques HFT® have a Range of Backing Tape® to support all welding currents, from 80 amps, up to as high as 600 amps, providing the support to produce perfect weld underbeads.

Georgia Gascoyne, CEO for HFT® said: “Weld Backing Tape® is a glass fibre weld backing system that supports and protects the weld root from oxidation. It will trap the inert gas from the weld torch to hold the gas surrounding the weld pool, effectively providing a back purge facility. We manufacture four grades of Weld Backing Tape® for use up to 80, 160, 240 or 600 Amps.”

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Health and Safety Sectors Benefits from Disruption-Free Pipe Repair with Accu-Freeze™

Pipe repairs, accu-freeze, valve changing, pipestoppersPublic buildings, factories, manufacturing plants, power stations, hotels, sports facilities, stadiums, apartment blocks and all commercial constructions may have pipework systems such as sprinkler systems for example, that are full of water or other fluid that need to be completely drained for the smallest of repair. Such drainage costs time, money with respect to the product that is lost, plus delays and costs related to bring the system back online.

Now repairs can be done in-situ with the Accu-Freeze™ System, which will work on metal and plastic pipes up to 12” diameter, making ice plugs either side of the repair site without draining the whole system.

The Pipestoppers® Division of Huntingdon Fusion Techniques HFT® recently carried out an installation of an Accu-Freeze™ System for a client who was contracted to repair pipework in large blocks of apartments. Working in the plant room, access was pretty tight as the pipes were only 6 – 8” from the ground. At one end of the pipe there was a pressure gauge and at the other, a 1,000 litre hot water cylinder. Ambient temperature in the pipe was approximately 38ºC.

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Food and Beverage Industry Tubes and Pipes Benefit From Better Welds

oxygen analyzer, ppm trace, mk v, purgeye 100, low cost monitorWhen tubes and pipes in the Food and Beverage Industry are welded, it is vital that they are free from oxidation and discolouration. Welds that are not free from heavy oxidation may protrude into the pipe and create traps where product may build up over time and which could contaminate the product moving through the pipe. Measuring the oxygen level before, during and after welding therefore is vital to prevent these occurrences.

One way to measure the oxygen is to use a Weld Purge Monitor® and one of the leading instruments for this is the low cost PurgEye® 100 designed and manufactured by Weld Purging Experts Huntingdon Fusion Techniques HFT®. The PurgEye® 100 eliminates any guesswork about oxygen levels, providing accurate readings from atmospheric level down to 100 parts per million (ppm).

The PurgEye® 100 has a clear, easy to read LCD screen, with a 24 mm high display, which has a low battery icon. When the monitor is not in use, an automatic sleep mode activates to conserve battery life. The PurgEye® 100 is IP65 rated and comes with leak-tight push buttons, auto calibration features, vacuum-sealed leak-tight probe assembly, wrist/neck strap and tripod mount.

A customer in the UK recently said: “We use your PurgEye® 100 Weld Purge Monitors twice a week on our five automatic dome welding machines for calibration purposes. I have to say that they are highly reliable and robust. If we need more or replacements we know where to go.”

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On-Site Weld Purge Monitor® for the Petrochemical Industry

oxygen monitor, weld purging monitor, gas analyzer, ppm traceWelding within the Petrochemical Industry involves working in refineries and plants that produce gasoline and a variety of other petroleum-based products as well as chemicals and oil-related products. Welded joints in these applications are often critical and the insides of pipework must be purged with expensive argon gas to reduce the oxygen levels around the joint below 100 ppm.

Due to the challenges of welding on-site in the Petrochemical Industry, Weld Purging Experts Huntingdon Fusion Techniques HFT® have designed a virtually non-destructible Weld Purge Monitor® for on-site conditions. The PurgEye® Site is a guarded oxygen monitor in a secure, safe, waterproof and dustproof, very tough carry case.

Ron Sewell, Chairman for HFT® said: “The PurgEye® Site measures oxygen levels from 1,000 ppm, right down to 1 ppm (accurate to 10 ppm). It is portable, robust and has been specifically designed for site conditions. The housing case for the monitor is IP65 with the lid open and IP68 rated with the lid closed.”

“The PurgEye® Site has a new design, fast response, long life sensor and it is equipped with PurgeNet™ facility that allows it to connect to a variety of accessories. One of the accessories is a link to an automatic welding machine, which allows controls to be based upon the oxygen level, to prevent welding if that level is too high. Other accessories include a traffic light visual indication system and a temperature gauge.”

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Weld Purging of Pipes for the Oil and Gas Industry

rapid purge, quickpurge, huntingdon fusion, pipe weld purging, tube and pipe purging

Weld Purging tubes and pipes for the Oil and Gas Industry is crucial when joining metals such as stainless, duplex and chrome steels, as well as nickel alloys, titanium and zirconium. However, when welding larger pipe diameters it is not cost effective to completely fill tubes and pipes with expensive inert gas.

Weld Purging Experts Huntingdon Fusion Techniques HFT®’s innovative QuickPurge® Systems dramatically reduces the space that needs to be purged, thereby reducing purging time dramatically, making huge savings in both time and gas costs.

Ron Sewell, Chairman for HFT® said: “Using QuickPurge® means there is no longer a need to fill complete pipes with an inert gas. The Systems are so efficient they pay for themselves in the first couple of welds in gas savings alone, whatever the pipe size. QuickPurge® is simply inserted into a tube or pipe, inflated within the pipe, restricting the area that is to be welded, removing the oxygen down to 100 ppm (parts per million) within minutes.”

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