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Weld Purge your Heat-Treated Pipes with HotPurge®

Hotpurge, welding Chromium-molybdenum (chromoly), weld purging, pre heat welding, post weld heat treatment

New power plants are in high demand and several hundred are expected to be built over the next decade. Chromium-molybdenum (chromoly) steel pipe such as P91 is a major construction material for the high pressure piping in these plants and there are particular techniques for welding this pipework to avoid potential catastrophe caused by oxidation.

Pre-heat and post-weld heat-treatment are mandatory and absolutely critical to the service life of the alloy. Chromoly is a low alloy steel and has also been used to produce tubing for bicycle frames and racecar roll cages. It is not as lightweight as aluminium alloys, but has the advantages of high tensile strength and malleability.

To ensure the welds are free from oxidation, which could otherwise lead to a loss of corrosion resistance, they must be welded with an excellent shield of inert gas, both inside and outside the pipe joint.

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Low Cost Weld Purging with Weld Purge Plugs™

weld purge plugs, weld purging, back purging, purge and weld, huntingdon fusionWeld Purging smaller tubes and pipes of different diameters can be challenging, especially when budgets are tight. Often, Welders are left to create their own homemade purging dams out of unsuitable materials such as foam, paper or cardboard.

Huntingdon Fusion Techniques HFT® have designed and developed clinically clean, white Nylon Weld Purge Plugs™, providing a great barrier for weld purging at a very low cost.

Luke Keane, Technical Sales Manager for HFT® said: “For welding complicated nickel alloy, titanium and stainless steel tubes and pipe joints as well as stubs, elbows and tees, Weld Purge Plugs™ are a perfect product to seal all holes and orifices for quality internal weld purging. They can also be used for weld purging small or odd diameter pipes where conventional inline pipe purging systems may not be practical.” 

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Advanced Weld Purging with the PurgEye® 200

purgeye 200, weld purge monitor, oxygen reader, ppm trace, gas analyzer

Metallurgically sound and oxide-free welds are a minimum requirement now when welding stainless steel, zirconium, nickel alloys and titanium. Quality control procedures are in place within most industries and welders are no longer able to ‘guess’ when their oxygen level is low enough to begin welding.

Oxygen levels as low as 50 parts per million (ppm) are often required when welding these reactive metals, however, the welding industry is no longer able to use old fashioned oxygen analyzers which are unable to reach this level.

The rechargeable, hand held PurgEye® 200 is a Weld Purging Monitor® specifically developed and designed for welding stainless steel, zirconium, nickel alloys and titanium.

Georgia Gascoyne, CEO of Weld Purging Experts Huntingdon Fusion Techniques HFT® said: “The PurgEye® 200 portable 10 ppm monitor will ensure zero colour, non oxidised welds are achieved every time, with accurate readings down to 10 ppm.” 

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Save Money by Restricting your Weld Purge Zone

purgelite, tube and pipe purging, weld purging, huntingdon fusion, pruge bladdeIt is often very common for welders to spend hours waiting for their weld purge level to be low enough to begin welding. Without restricting the purge zone with an inflatable pipe purging system when welding stainless steel, titanium or zirconium tube and pipes, displacing the oxygen in entire pipelines with an inert gas (usually argon), can cause a lot of wasted time and gas.

Experts in the field of tube and pipe weld purging, Huntingdon Fusion Techniques HFT® design and manufacture PurgElite®, a range of low cost Tube and Pipe Purging Systems to achieve a clean, oxide free, zero colour weld in just minutes.

Ron Sewell, Chairman for HFT® said: “To save welders the expense of completely filling tubes and pipes with an inert gas, PurgElite® Systems are available. They inflate and seal in the pipe, restricting the volume that is needed to be purged. This not only saves welders time waiting for pipes to be purged, but also inert gas costs.”

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Highly Accurate 100 ppm Weld Purge Monitor for Welding Stainless Steel

purgeye 100, low cost welding, welding stainless steel, weld purging, weld purging technology

Measuring the oxygen level with a Weld Purge Monitor® before, during and after welding stainless steel is crucial to achieve oxide free, zero colour welds that are metallurgically sound. It is important not to use “oxygen analyzers” or “oxygen safety monitors” as they are calibrated for accuracy only at ambient conditions.

The low cost, hand held, battery operated PurgEye® 100, designed and developed by Huntingdon Fusion Techniques HFT® is perfect for welding stainless steel, reading accurately from atmospheric oxygen level (20.94%), right down to 100 parts per million (ppm) of oxygen

Ron Sewell, Chairman for HFT® said: “We are extremely proud of the PurgEye® 100, our Flagship Product. This monitor is specifically designed for weld purging and is available at a competitive price, so that it will pay for itself in just a few welds.

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.

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Inflatable Welding Enclosures provide low cost Argon Gas Shielding Environment

flexible welding enclosure, welding bubble, metal glove box, welding chamber

Welding applications within industries such as the Aerospace, Additive Manufacturing and F1 Racing as well as Medical, Pharmaceutical, Semiconductors and any other company that needs super clean welding joints, have a requirement of absolute cleanliness and smoothness of surfaces, ensuring each weld is mechanically stable and free from oxidation.

Titanium is often the metal of choice for such joints and being a reactive metal, must be shielded with argon during welding to protect the molten metal from oxygen, moisture and nitrogen. It is inevitable that some shielding methods will occasionally fail to fully protect the weld and may lead to a loss of corrosion resistance properties and a rejected weld.

Reliable exclusion of reactive gases in the welding environment is guaranteed when using a low cost Flexible Welding Enclosure®, together with a Weld Purge Monitor® designed and manufactured from Weld Purging Experts Huntingdon Fusion Techniques HFT®, to achieve and show oxygen levels as low as 10 parts per million (ppm).

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Low Cost Weld Purge Barrier for a wide range of Pipe Sizes

weld purge Film, water soluble film. weld purging, purge and weld, back purgingWeld Purging various sizes of tubes and pipes at a low cost can be challenging. Many welders today continue to construct their own dams to cut costs. Homemade dams made from material such as foam, sponge or paper can often lead to loss of welds when they leak or slip from position thus flooding the welding zone with oxygen.

Leaders in Weld Purging Technology, Huntingdon Fusion Techniques HFT® offer Weld Purge Film Kits to overcome these challenges, ensuring all welders can achieve a great purge every time, at a reduced cost.

Ron Sewell, Chairman for HFT® said: “With the use of our low cost Weld Purge Film®, welders can ensure that their dams do not come loose during welding, thus, no more lost welds!”

Weld Purge Film® Kits can be used on pipe diameters up to 900 mm (36”) and for temperatures up to 300ºC (572ºF) without the material burning, coming loose and losing the weld purge.

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Cost Effective Pipe Repairs with Accu-Freeze™

accu-freeze, qwik-freezer, pipe freezing, tube freezing, liquid nitrogen pipe freezingWhen making repairs to pipes, for example changing valves, it is common to have to drain down the entire system before the repairs can be made, which can lead to high disposal costs, loss of product and cost of time spent draining and disposing of the product.

To dramatically reduce these costs Accu-Freeze™ is available from the Pipestoppers® Division of Huntingdon Fusion Techniques HFT®.

Accu-Freeze™ is a Pipe Freezing System, which uses liquid nitrogen (LN2) to eliminate disposal of material and all associated costs by freezing stationary liquids in a selection of pipe or tubing.

Luke Keane, Technical Support for HFT® said: “The ice plug only forms beneath the Accu-Freeze™ coil wrap, jacket or aluminium clam jacket. The system is effective on 6 - 12" (150 to 300 mm) pipe or tube. The ice plug does not expand outside of the range of the jacket or coil.”

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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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