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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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Weld Purge Monitor® for the Nuclear Industry

oxygen reader, oxygen sniffer, weld purging technology, huntingdon fusion techniques, back purgingWith the growth of Nuclear Power activities around the World, there is a large volume of stainless steel pipework that will need to be welded to a high standard, with no oxidation that can lead to loss of corrosion resistance.

To meet the higher standards of welding that the Nuclear Industry expects, a unique Weld Purge Monitor® has been designed and developed by Weld Purging Experts Huntingdon Fusion Techniques HFT® that reads all the way from atmospheric level of oxygen (20.94%), down to one part per million (0.0001%), in one instrument.

CEO for HFT®, Georgia Gascoyne said: “The PurgEye® 600 incorporates the features and benefits of all the other Weld Purge Monitor® designs in the HFT® Family Range, but for the first time, this one instrument has a full range of measurement reading from atmospheric concentration (20.94%), down to 1 ppm, accurate to 10 ppm. Readings are indicated either as parts per million or in percentage, breaking all technological boundaries in one instrument.”

Using ground breaking technology, the PurgEye® 600 has a long life sensor. This high level, advanced instrument has been designed with a large, full colour touch screen (3.2"/ 81 mm) and on-screen graph displaying the oxygen levels during the welding process.

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Fire Sprinkler Systems – Easy Valve Replacement with Qwik-Freezer™

pipe freezing, valve replacement, pipe and tube repair, huntingdon fusion, Replacing valves in fire sprinkler systems can be a challenge, especially when the pipelines have liquids running through them. One option is to completely drain the system to make the repairs, which can prove costly, time consuming and problematical as to where to drain the liquid.

Pipe Freezing Experts Huntingdon Fusion Techniques HFT® recently introduced the Qwik-Freezer™ Systems to their Pipestoppers® Division. These systems create ice plugs or freeze seals in the pipes, either upstream of a valve or on both sides, avoiding the requirement to completely drain down systems and making a substantial reduction in lost time and costs.

Qwik-Freezer™ is the industry standard portable CO2 Pipe Freezing System, in use around the World, covering pipe diameters from 3/8” – 8” (9 – 200 mm). The quick and easy to use system requires very little set-up time and is the only CO2 Pipe Freezing System capable of freezing larger pipe diameters.

HFT®’s US Partner, COB Industries said: “When a sprinkler head has to be repaired or replaced in a large system, there are many issues that can arise. Draining large fire systems can create problems with disposal of all the water, more so when it is treated chemically with rust inhibitors and/or anti freeze. Environmental concerns prevent disposing of this water in a normal drainage system, even if it is possible to access one.”

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Flexible Welding Enclosure® for use in the Aerospace Industry

welding enclosure, flexible welding, welding in the aerospace, welding bubbleWhen welding titanium or nickel alloy parts within the Aerospace Industry, it is important that the welding zone is purged of oxygen to a level as low as 10 parts per million (ppm).

Flexible Welding Enclosures® are available for a fraction of the cost of a rigid welding chamber, providing a technically viable option to the very expensive rigid metal chambers. Size for size, these Enclosures cost considerably less than a metal glove box or a vacuum system, with a very fast purging time down to a few ppm of oxygen. The Welding Enclosures are ideal for small production quantities of items that need total gas coverage as well as single large items with critical joints.

A combination of translucent material and optically clear sheet is used depending on the viewing requirements of the customer. Large access zips are fitted to each Enclosure and additional entry points can be provided for operators’ gloves. A service panel incorporates access ports for welding torches, electrical leads and water-cooling supplies and a purge gas entry port and exhaust valve are also manufactured as standard to vent displaced gas into the atmosphere.

Flexible Welding Enclosures® are used by companies such as British Airways, Airbus, Pratt and Whitney, Lufthansa, Senior Engineering and Shapes Aerospace International along with many other companies in the Aerospace field.

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On-Site Weld Purge Monitor® with PurgeNet™

purgeye, gas sniffer, oxygen analyser, oxygen monitor, weld purgingWelders often face difficulties when working under the conditions experienced on-site. When welding critical joints on-site the challenges might come from exposure to extremes of heat and cold, harmful sand and dust and even hazardous fumes. Therefore using an expensive Weld Purge Monitor® in such conditions may not always be ideal.

To overcome these challenges, Weld Purging Experts and Innovators Huntingdon Fusion Techniques HFT® have designed a virtually non-destructible Weld Purge Monitor® for on-site conditions. Designated the PurgEye® Site, this new instrument is a guarded oxygen monitor in a secure, safe, waterproof and dustproof box, IP68 with the lid open and IP65 rated with the lid closed.

CEO Georgia Gascoyne said: “The latest addition to the Family Range of the PurgEye® Weld Purge Monitors® is the PurgEye® Site, measuring 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 PurgEye® Site has a new design long life sensor with a very fast response time, ultra sharp OLED display and is equipped with PurgeNet™ for smart weld purging, automatic welding machine interface and traffic light visual warning accessory.”

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Low Cost 1 PPM Weld Purge Monitor® designed for the Process Industries

purging monitor, ppm trace monitor, oxygen sniffer, gas analyser, huntingdon fusionDue to the constant upward trends in Quality Control procedures, there is growing pressure on the Process Industries to carry out their welding in the absence of oxygen to an ever increasingly lower level. Metals such as stainless steel, titanium, zirconium and nickel alloys are now available to these industries to ensure the greatest strengths, the highest resistance to corrosion and of course the lowest failure rates.

These metals are commonly welded with the GTAW (TIG) process that needs the arc and its surrounding zone to be shielded with a high specification inert gas that has the minimum amount of oxygen. If the welds and their adjacent metal become oxidised, that leads to a lower resistance to corrosion and that has to be prevented.

For this purpose, Weld Purge Monitors® were invented in the 1970’s to measure the oxygen levels for welding by World Leading Weld Purging Experts Huntingdon Fusion Techniques HFT®. At the time, 100 parts per million of oxygen in argon was deemed to be a good level for most stainless steel and other metals, however research shows that it has become necessary these days to try to attain a purity approaching 1 ppm of oxygen in argon when shielding the welds zones in front and behind.

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