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Large Diameter Pipework Fabrications

37W QuickPurgePipeWeldPurgeSystemLarge diameter pipework can cause several challenges, especially when those pipes are manufactured from stainless, duplex and chrome steels, titanium or zirconium. When welding such reactive materials, they need to be purged of oxygen before, during and after welding.

It is not cost effective to completely fill pipework with expensive inert gas, so weld purging experts Huntingdon Fusion Techniques developed QuickPurge® Systems to dramatically reduce the space that needs to be purged.

Ron Sewell, Chairman for HFT® said: “Using QuickPurge® means there is no longer a need to fill complete pipework fabrications with an inert gas. These devices localise the gas purging to a space about 10” (250 mm) either side of the weld to reduce purging time dramatically, making huge savings in both purging time and gas costs.”

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Supplementary Gas Shielding with an Argweld® Weld Trailing Shield

weld trailing shield, inert gas shielding, inert gas purging, weld purging, purge and weld

Eliminating oxidation and discolouration when welding stainless and duplex steels as well as titanium, zirconium and nickel alloys is crucial in many industries today, because of improving quality control procedures. Welds have to be free from metallurgical defects otherwise they can potentially be rejected, often leading to a significant loss in time and resources.

The quality of welds on tubes, pipes and flat sheet metal can be dramatically improved with the addition of a low cost Weld Trailing Shield®.

Huntingdon Fusion Techniques HFT® have designed and developed Argweld® flat and radiused Trailing Shields® which simply attach onto any TIG/GTAW, PAW/Plasma and MIG/GMAW welding torch, providing an additional inert gas coverage during welding of reactive metals where discolouration or oxidation needs to be eliminated.

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TEG-1000 Tungsten Electrode Grinder

teg1000, teg3, weld purging, huntingdon fusion, welding world The Tungsten Electrode is one of the most important variables involved in TIG welding. Preparing your Tungsten Electrode correctly will help to improve arc starting, arc stability and weld quality.

Tungsten Electrode Grinders are a convenient, safer and more accurate way than other methods of grinding Tungsten Electrodes. Huntingdon Fusion Techniques HFT® now manufacture the TEG-1000 Tungsten Electrode Grinder with a diamond wheel, producing smooth, perfect surface finishes that eliminate arc jumping leading to consistent welds.

Ron Sewell, Chairman for HFT® said: “An incorrectly ground Tungsten Electrode tip may drop into the weld pool and create a tungsten inclusion that could lead to a weld cut-out or reject, either way, leading to additional welding costs and lost time. It can also result in a huge reduction in tip life and changes in arc voltage.” 

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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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