Welders 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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Due 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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There is a large variety of pipe plugging and blocking requirements in the Oil and Gas Industry, including repair work, leak testing, weld purging and debris stopping. One major concern is the entry of debris into pipes during operations.
The Pipestoppers® Division of Huntingdon Fusion Techniques HFT® now design and manufacture a range of low cost, lightweight Inflatable Stoppers, available for pipes up to 120” diameter to prevent the entry of debris into pipes.
Ron Sewell, Chairman for HFT® said: “For pipe diameters of 36” and over, not all applications require expensive and very robust, heavy rubber plugs, nor is it always necessary to use mechanical plugs which are also heavy and may be difficult to manipulate.”
“Where there is little backpressure and the absence of corrosive petrochemical fluid, lightweight Inflatable Stoppers are a great solution. They are light in weight, which makes them easy to manipulate and inexpensive to ship and because of their low cost, it is easy to keep all sizes in stock and ship them the very same day.”
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High strength steel joints must pre-heated prior to welding and also require a post-weld heat treatment. Weld joints of this nature are often purged of oxygen and welded in an inert atmosphere to reduce the risk of ‘sugaring’, an imperfection that could allow metal pieces to break off inside pipework and cause damage to turbines, for example.
With the high temperatures and length of time at such temperatures, most weld purging systems are unsuitable. HotPurge® has been developed by International Weld Purging Specialists Huntingdon Fusion Techniques HFT®, an Inflatable Pipe Purging System for Heat Treated Chrome and High Strength Stainless Steel Pipe Joints where the temperatures might be as high as 300ºC (572ºF) for many hours.
Luke Keane, Distributor Support for HFT® said: “HotPurge® allows the purge to be safely continued for up to 24 hours whilst pre-heating, welding and post weld heat-treating with the purge system remaining in place.”
“Along with our other ranges of Inflatable Pipe Purging Systems, the HotPurge® Systems are manufactured in the UK, with scientific knowledge and research invested in each of our products. We do not sacrifice quality! You can be sure to achieve perfect welds, time and time again.”
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Weld purging is the act of removing oxygen from the vicinity of a joint with an inert gas. It is essential when welding metal tubes and pipes made from titanium, stainless steel, chrome and nickel steels where a high strength joint or an exceptionally clean and smooth joint is needed. For example in power piping and ultra high purity stainless steel joints it is important to have a good weld purge that will provide non-oxidised, zero colour welds.
PurgExtra® Inflatable Tube and Pipe Purging Systems, available from Weld Purging Experts Huntingdon Fusion Techniques HFT®, provides an extra gas purge for weld purging tube and pipe joints from 1 – 24” ø. This range complements the PurgElite® Series that has a single purging inlet.
Luke Keane, Distributor Support for HFT® said: “The PurgExtra® System allows the operator to purge at the recommended rates initially and then, when conditions are correct, to introduce the additional gas at high flow rates. This system is especially valuable for achieving the lower oxygen levels required for welding materials around 20 parts per million.”
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To ensure non-oxidised, zero colour welds are achieved when welding metals such as stainless, duplex and chrome steels, titanium and nickel alloys, a Weld Purge Monitor® (oxygen monitor) must be used to measure the oxygen level before and during welding.
The World Standard PurgEye® 100 IP65 Weld Purge Monitor® designed and manufactured by Weld Purging Experts Huntingdon Fusion Techniques HFT® is available at a low cost, avoiding the requirements to fill entire tubes and pipes with expensive inert gas and avoiding the need to guess when the oxygen level is low enough to begin welding.
A customer in the UK recently said: “When working with medium to large diameter exotic pipework, using the PurgEye® 100 can prevent you from having a very bad day! Previously, I only ever used the older model and the introduction of the PurgEye® 100 was a godsend.
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