For closure welds, tight bends, T piece joints and dome end connections, a range of low cost, single ended Weld Purging Dams is available from Weld Purging Experts, Huntingdon Fusion Techniques HFT®.
Manufactured from low vapour pressure materials, Weld Purging Dams are in use for where a conventional Tandem Weld Purging System cannot be used.
Ron Sewell, Chairman at Huntingdon Fusion Techniques HFT® said: “Even today, many companies are still allowing their technicians to spend time fabricating dams made of foam, cardboard, adhesive tape, wood and so on. Like paper, these materials contain a high percentage of moisture, which is undesirable to have in the presence of a weld.”
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Supporting the backside or under side of weld joints will help prevent oxidation, eliminate re-welding and require much less post-weld cleaning.
Weld Backing Tape® available from Huntingdon Fusion Techniques HFT® supports weld roots, reducing sugaring and oxidation.
Georgia Gascoyne CEO Managing Director for HFT® said: “Low cost Weld Backing Tape® is very easy to use. By simply attaching the tape onto the root gap using the adhesive aluminium tape either side of the glass fibre centre, which keeps the weld joint free from weld tacks.”
“After welding, the Weld Backing Tape® is removed, leaving the weld free from oxidation with no back gouging or grinding required.”
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The exposure to oxygen during the welding process on alloys such as stainless steel will result in discolouration and can severely reduce corrosion resistance properties. It is therefore crucial that the oxygen level is monitored throughout the welding process and kept to a desired level.
However, is often difficult for welding personnel to get an accurate reading of the oxygen level at the welding zone when welding lengths of tube and pipework of 20 metres length and more.
Huntingdon Fusion Techniques HFT®, a Weld Purging Products Manufacturer, has created the PurgEye® 1000 Weld Purge Monitor®, enabling operators to read the weld purge gas level from a distance for the first time.
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The presence of moisture on the joint surface can create porosity in the weld metal. It is therefore important that the dew point is monitored so that welders are made aware when moisture is likely to be present.
Innovators in Weld Purging Huntingdon Fusion Techniques HFT® have recently developed the PurgeNet™ Dew Point Purging Gas Moisture Sensor™, an important predication instrument of when water will form on metal surfaces in the welding environment.
Ron Sewell, Chairman for HFT® said: “Under arc conditions, water is broken down into hydrogen and oxygen in atomic form which, when present in weld metal, cause porosity and are known to create cracking in the weld joint. Water can form as moisture on metal surfaces while welding, so it is crucial to be able to measure ‘Dew Point” while welding lengthy critical joints as conditions can change during the welding process.”
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When it comes to pipe purging, it is not desirable, nor cost effective to simply pour inert gas into the pipe assembly in the hope that a good purge is achieved. A tough, leak tight purging barrier is required.
To keep purging costs down, Weld Purging Experts, Huntingdon Fusion Techniques HFT® have designed and developed Weld Purge Film®, a water-soluble polyvinyl acetate purging barrier for a variety of pipe sizes.
Luke Keane, Technical Sales Manager for Huntingdon Fusion Techniques HFT® said: “It is so easy to cut a circle of water-soluble film and place it a short distance away from the root gap before welding, pasting in place with the Argweld® Water Soluble Super Adhesive® to ensure a tough leak tight barrier, keeping the purging volume to the barest minimum. Argweld® Weld Purge Film® offers users the opportunity to make significant economies by minimising gas usage and cutting down dramatically on time taken to make a purge, whilst at the same time, achieving a desirably low oxygen level.”
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Prior to welding of titanium, widely practiced in the aerospace Industry, the oxygen content of the purge gas must be reduced to a level below 50 ppm.
Engine components such as discs, blades, shafts and casings, from the front fan to the rear of the engine, and fasteners, airframe components and landing gear are all examples where titanium is used. Further examples are fuel tanks for satellites and military jets. Components such as wing spars have also been made recently out of titanium using the Wire Arc Additive Manufacturing (WAAM) process.
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 weld 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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The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® provides a cost saving solution to carrying out repairs or modifications on pipes with liquid inside, which also includes valve replacement.
Replacing valves in pipework 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.
Georgia Gascoyne, CEO for HFT® said: “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.”
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With the ever-increasing activities in such industries as the Nuclear, Oil and Gas and Engineering, there is a large volume of stainless steel, zirconium and titanium pipework that will need to be welded to a very high standard.
An effective Weld Purge Monitor® present, in conjunction with weld purging equipment when making joints will ensure engineers have an accurate oxygen reading before, during and after the welding cycle.
Huntingdon Fusion Techniques HFT® manufacture a unique, stylish, all singing and dancing Weld Purge Monitor®, the PurgEye® 600, which reads from atmospheric level of oxygen (20.94%), down to one part per million (0.0001%).
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Heavy-duty leak testing, sealing, pipe blocking and stopping is easy with Steel Plugs from the Pipestoppers®.
Steel Test Plugs can be used for low pressure testing and plugging pipes, pipelines and pipework fabrications and other orifices between 2 and 48” (50 to 1,200 mm) diameter.
Luke Keane, Technical Sales Manager for HFT®’s Pipestoppers® Division said: “Plugging challenges are a thing of the past with our Steel Plugs range. They provide a strong, leak-free seal with each plug having a long life span.”
“Where plugs might be required to work close to the top of their pressure range and to hold seals longer than would be the case with single plugs, we also manufacture Double Steel Plugs, which increases the capability of the plug.”
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When it comes to TIG welding, Tungsten Electrodes are the most important part of the application. A properly ground Tungsten Electrode will help to improve arc starting and stability, giving an overall better performance.
Huntingdon Fusion Techniques HFT® manufactured the TEG-1000 Tungsten Electrode Grinder with a diamond wheel, resulting in clean and smooth finishes, with no splintering and eliminating arc jumping.
Ron Sewell, Chairman for HFT® said: “Grinding Tungsten Electrodes with a dedicated Tungsten Electrode Grinder will help produce a stable arc, which then provides greater tungsten life. Grinding Tungsten Electrodes incorrectly may result in the tip being dropped into the weld pool, which may lead to weld cut-out or rejection.”
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Typically for closure welds, tight bends, T piece joints and dome end connections where a conventional Tandem Weld Purging System cannot be used, a range of low cost, single ended Inflatable Weld Purge Dams is available for pipe diameters from 6 to 88 inches (150 mm up to 2,235 mm).
Weld Purge Dams from Huntingdon Fusion Techniques HFT® offer a great, lightweight solution where access is difficult, are easy to inflate and heat resistant up to 80oC (176oF).
Ron Sewell, Chairman at Huntingdon Fusion Techniques HFT® said: “Even today, many companies are still allowing their technicians to spend many hours fabricating dams made of foam, cardboard, adhesive tape, wood and so on. Like paper, these materials contain a high percentage of water, which is very undesirable to have in the presence of a weld.
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In the power generation and nuclear industry, low and medium alloy steels such as SA 213 T91 and SA 335 P91 are chosen for their high strength, but are often prone to cracking during welding. Pre-heating and post-heating reduces the crack sensitivity.
