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Tube and Pipe Weld Purging costs paid in one weld with PurgExtra®

purgextra, pipe purging, purging bladder, huntingdon fusion, weld purging

Weld Purging is the act of removing oxygen from the vicinity of a weld, before, during and after the welding of certain metals, such as stainless steel titanium and nickel alloys. An inert gas is used (usually argon), displacing the oxygen from the weld zone and therefore ensuring the metal does not come into contact with oxygen as it is heated, which could lead to oxidation and a loss of corrosion resistance properties.

For tube and pipe welding, it is proven very cost effective to restrict the area needed to be purged, making vast savings on time and inert gas costs. This is done using an inflatable tube and pipe purging system.

PurgExtra® has been developed, for purging tube and pipe joints from 1 – 24” diameter. This design features an extra gas purge hose to speed up the purging process to ensure that the cost of the product is paid for in just one weld.

Luke Keane, Technical Support for HFT®, the leader in Weld Purging Technology, said: “A PurgExtra® System is simply inserted into a pipe and positioned using RootGlo®, a material adhered to the centre of each System, allowing the welder to see the System clearly through the root gap.”

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Heavy-Duty Pipe Plugs

PlugFast, Peripheral Sealing Plugs, pipe stopping, heavy duty pipe stoppersPipe stopping and blocking where there are chemicals or high temperatures present can cause many challenges in a variety of industries including Plumbing, Oil and Gas and Petrochemical. Furthermore, if those pipes have some small ovality problems it presents additional difficulties in order to achieve a good sealing.

Peripheral Sealing Plugs for heavy-duty applications such as immersion in chemicals and / or exposure to high temperatures are now available from HFT®, which has a division solely focussing on pipe blocking, stopping and sealing know as Pipestoppers®.

The Pipestoppers® Heavy-Duty Sealing Plugs are manufactured to suit pipe ends or orifices having a 17” (432 mm) diameter, extending to 96” (2,400mm). The plugs are specifically designed for heavier duty applications such as long immersion in water, for use at higher temperatures or for contact with acidic or alkaline environments for which other pipe plugs and stoppers are not suitable. 

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Eliminate Thoria by Switching to MultiStrike® for Safer Welding

multistrike tungsten electrode, there free tungsten, green tungsten, blue tipped tungsten, huntingdon fusion

Thoriated Tungsten Electrodes contain thoria, a radioactive element that can be dangerous to heath. During the grinding of the electrode there is a generation of radiotoxic dust, with the risk of this being inhaled by the welder.

Welders today continue to use thoriated Tungsten Electrodes. Because thoria was much cheaper than alternative elements to lower the work function of pure tungsten, this type became the industry standard.

To overcome the risk posed by the harmful thoria and 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 radioactive thoriated Tungsten Electrodes.

A customer in the UK recently said: "MultiStrikes® are the most consistent Tungsten Electrodes I have used over the past 34 years. I would not use anything else now. I do not think that many people realise how important a good electrode is.”

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Titanium Welding with the PurgEye® Desk

purgeye desk, weld purge monitor, weld purging, inert gas welding, purgenetThe Welding Institute (TWI) state that: “Titanium is a reactive metal; it will burn in pure oxygen at 600°C and in nitrogen at around 800°C. Oxygen and nitrogen will also diffuse into titanium at temperatures above 400°C raising the tensile strength but embrittling the metal. In the form of a powder or metal shavings titanium also constitutes a fire hazard. Despite this reactivity titanium is used extensively in chemical processing, offshore, automotive, medical, aerospace and numerous other applications.“

During the welding of titanium, it is therefore crucial that the oxygen level surrounding the weld is purged of oxygen down to as low as 50 ppm or less. Titanium parts are usually welded inside a welding enclosure, where the entire atmosphere surrounding the weld can be kept at a controlled level of oxygen.

The innovative PurgEye® Desk, a new monitor designed and manufactured by weld purging experts Huntingdon Fusion Techniques HFT®, is leading the way in inert gas purging technology by reading oxygen levels from 1,000 ppm, right down to levels as low as 1ppm (highly accurate to 10 ppm), ensuring welders achieve perfect oxide free, zero colour welds time and time again.

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Chemical Resistant Inflatable Stoppers for blocking pipes containing hydrocarbon liquids and gases

petrochem stoppers, petrochemical resistant pipe stoppers, pipe blocking, pipe stopping.

During petrochemical operations, where hydrocarbons are present in liquid or gas form, inflatable stoppers are often used for various applications such as debris stopping, leak testing, low-pressure hydrostatic tests, blocking the release of hydrocarbon gases and a variety of plumbing operations.

To meet the challenges of such intense conditions, the Pipestoppers® Division of Huntingdon Fusion Techniques HFT® manufacture a range of hydrocarbon resistant versions called PetroChem® Inflatable Pipestoppers®.

Standard models are manufactured in cylindrical and spherical formats from 1 – 96” (25 – 2,440 mm) in diameter with a high-grade latex, rubber internal inflatable bag covered with a petrochemical resistant layer, which has a tough, woven impregnated nylon outer cover for use up to 90ºC (194ºF).

The versatile Inflatable Stoppers are used to service a wide variety of industrial applications. As “overnight stoppers” they provide a strong barrier in pipeline activities, to prevent foreign bodies entering the line during downtime.

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Inert Shielding Gas Monitor for Stainless Steel Welding

weld purge monitor, gas analyzer, oxygen sniffer, ppm trace, purgeyeInert shielding gas is used to protect high integrity welds from oxygen and water vapour during TIG (GTAW) and Plasma (PAW) welding processes.

When welding tanks, vessels, chambers and pipes, the most cost effective inert gas used for shielding is argon. As argon is heavier than air, it displaces the air containing oxygen and water upwards and out of a vent tube which can be fed to a Weld Purge Monitor®.

This process, called Weld Purging, will ensure oxide free, metallurgically sound welds in critical joints made of stainless steel, titanium and other refractory metals.

During stainless steel welding, the oxygen content must be purged down to a level lower than 100 ppm. Titanium and other sensitive materials may have to be purged down to 20 parts per million to obtain oxide free joints. Measuring the oxygen level in shielding gas is therefore crucial.

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Standard and Custom Made, Low Cost Weld Purge Dams

inflatable weld purging dams, purge bladder, weld purging, purge welding, inert gas welding

When welding stainless steel, titanium or zirconium pipes, or pipework, the oxygen level within the pipe must be reduced to a level of 50 ppm, or lower in certain cases. The most cost-effective solution is to restrict the volume around the joint with a Tandem Weld Purging System.

For the purging of short pipe pieces and dished end or dome end welds however, the tandem devices are unsuitable. To overcome these challenges, experts in Weld Purging Technology Huntingdon Fusion Techniques HFT® have designed and manufactured Weld Purge Dams.

Ron Sewell, Chairman at HFT® said: “As well as the standard range of Dams, we have introduced custom made special Weld Purging Dams for a variety of applications. We recently designed a ‘donut like’ Weld Purge Dam to purge a pipework fabrication, where one pipe was inside the other. The Special Dam fit on the inside of the larger pipe and purged the space between the two pipes.”

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Ensure your Pipe Purging System doesn't burst with PurgeGate®

purgegate, one way value, inflatable weld purging system, quick purge, huntingdon fusionVarious Inflatable Pipe Purging Systems are in use Worldwide for welding titanium, stainless steel and zirconium tubes and pipes. Often, these purging systems are inflated beyond their capacity and burst mid-weld, resulting in a lost weld and broken purging system.

To ensure the gas going through the pipe purging system is controlled, Huntingdon Fusion Techniques HFT® have designed and developed PurgeGate®, a unique valve which regulates the pressure and flow of gas that is passed through the system, ensuring the system will not burst regardless of the pressure and flow rate.

Ron Sewell, Chairman for HFT® said: “This low cost accessory has been designed and constructed to pass a maximum of 7.5 litres/min and 0.5 bar pressure. Other versions of 1bar and above are also available.”

“Designated “PurgeGate®”, this nifty, hi-tech item has applications in both fluid and gas control. Its small size and low weight makes it valuable for small liquid dispensing machines, as well as large ones with multiple heads, where higher pressures and flow rates might be used to cater for the output of a multi-head machine.” 

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Low Cost, Entry Level 10 ppm Weld Purge Monitor

weld purge monitor, gas analyzer, oxygen sniffer, ppm trace, purgeye

Metals such as stainless steel, titanium, zirconium and nickel alloys are often required to be welded in an environment containing 100 parts per million (ppm) of oxygen or even less in some industries, guaranteeing the greatest weld joint strengths and the highest resistance to corrosion.

To ensure oxygen levels are low enough before, during and after welding of the most critical weld joints, leaders in Weld Purging Technology Huntingdon Fusion Techniques HFT® have designed and developed the low cost entry level PurgEye® Nano Weld Purge Monitor®.

Ron Sewell, Chairman for HFT® said: “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 may lead to a reduction of resistance to corrosion and potential joint integrity. These risks have to be prevented.”

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Safe, Fast and Low Cost Pipe Freezing with Qwik-Freezer™

pipe freezing, valve replacement, pipe and tube repair, huntingdon fusion, Repairs or modifications on pipes with liquid contents can pose a financial challenge, especially when those fluids might otherwise have to be disposed of causing unnecessary costs and perhaps commercial difficulties.

The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® provides a cost saving solution to this problem with Qwik-Freezer™, the industry standard portable CO2 Pipe Freezing System.

Qwik-Freezer™ is easy to use, requires little set-up time and is the only low cost CO2 Pipe Freezing System capable of making ice plugs in pipes up to 8” (200 mm) diameter.

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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Glass Fibre Backing Tape gives improved Weld Root Profiles

ceramic weld backing, glass fibre backing tape, Huntingdon fusion, weld purging, purge and weld

Weld Backing Tape™ is a common material used 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.

Ceramic Fibre is in use within the Welding Community, which has a melting point of 1,800ºC, causing concern when temperatures during TIG welding can reach up to 6,000ºC. A superior alternative to such material is Glass Fibre, which has no true melting point.

Weld Purging Experts Huntingdon Fusion Techniques HFT® have a Range of Glass Fibre Weld Backing Tape™, which can support the highest of temperatures.

Ron Sewell, Chairman for HFT® said: “A cost-effective way to provide support for molten metal below a weld joint, is to use Weld Backing Tape™. Our Backing Tape is able to support all welding currents from 80 amps, up to as high as 600 amps, giving welders and welding engineers the support to produce perfect weld underbeads.” 

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Special High Quality, Leak Tight Welding Hose for Argon Feed

argweld hose, welding hose, argon hose, nitrogen hose, purge and weldAdvancing forward in weld purging technology, Huntingdon Fusion Techniques HFT® now manufacture tailor made Argon Gas Feed Hose assemblies with leak tight fittings.

Luke Keane, Distributor Support for HFT® said: “It is important when welding stainless steels, titanium, zirconium and other reactive metals, that the welding zone is purged of oxygen, even down to as low as 20 parts per million (ppm). These special, high quality Argon Hoses, provide welders with a guaranteed leak tight method of feeding non-contaminated argon gas into their welding zone.”

The natural rubber feed hose comes complete with an argon regulator, which directly connects to any range of Inflatable Tube and Pipe Weld Purging Systems at one end and to the gas source at the other.

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