Titanium and stainless steel are both reactive alloys. When they are heated during the welding process, they will react with any air that is present, causing oxidation, which can lead to a loss of corrosion resistance properties. Shielding the metal with an inert gas is therefore crucial and one way to measure the oxygen content within the welding zone is by using a Weld Purge Monitor®.
Leading the way in Weld Purging Technology, Huntingdon Fusion Techniques HFT®’s PurgEye® Nano is ideal for welding titanium and high end stainless steel, where oxygen levels are required to be as low as 10 ppm.
Luke Keane, Technical Sales Manager for HFT® said: “By knowing the exact level of oxygen inside the pipe at all times, the welder knows when to start welding for high quality results. The PurgEye® Nano is our basic entry level 10 ppm Monitor, which means it is perfect for restricted budgets. It’s a simple plug and play monitor, ideal for welding titanium, stainless steel and other reactive metals such as zirconium.”
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During purging welders need to measure the oxygen content but also need to measure the ‘dew point’.
The dewpoint is the temperature where condensation begins and water will condense on the material being welded. This can affect the weld properties significantly.
Georgia Gascoyne, CEO for HFT® said: “We have recently added a Dew Point Sensor to our range that can be used in conjunction with our range of 10 ppm Weld Purge Monitors®, so rather than purchasing a separate, expensive Dew Point Meter, HFT®’s Dew Point Sensor can be connected to the Weld Purge Monitor® via the PurgeNet™ lead.”
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High quality Argon Gas Feed Hose provides welders with a method of delivering non-contaminated argon gas into their welding zone.
Huntingdon Fusion Techniques HFT®, Global Weld Purging Manufacturing Company, produce tailor made Inert Gas Feed Hoses, suitable for use for TIG welding where argon and other inert gas is used.
Georgia Gascoyne, CEO for HFT® said: “Our high quality Argon Gas Feed Hose is manufactured of a special low outgassing rate rubber feed hose, which comes complete with a regulator and can directly connect to any range of Inflatable Tube and Pipe Weld Purging Systems at one end and to the gas source at the other. Designed to help keep welding zones purged of oxygen.”
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What is Weld Purging? Weld Purging is the displacement of oxygen by an inert gas (usually argon) from the vicinity of a weld, before, during and after welding. It is crucial to displace the oxygen when welding many metals to help achieve oxide free, zero colour welds with no loss of corrosion resistant properties.
What are the benefits of a Pipe Purging / Weld Purge Monitor?
• Saves money. Removing any guesswork or estimates.
• Saves time. Inert gas consumption is significantly reduced.
Pipe Purging Experts Huntingdon Fusion Techniques HFT®’s PurgEye® 200 Weld Purge Monitor® will ensure zero colour, non-oxidised welds are achieved every time, with accurate readings down to 10 ppm.
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When welding titanium, it is essential that the oxygen level surrounding the weld is purged down to as low as 50 ppm. Measuring the oxygen level with a reliable oxygen analyzer is the most efficient way to know exactly when to commence welding.
Specifically designed for Purge Chamber welding, the PurgEye® Desk 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 oxide free, zero colour welds are achieved time and time again.
Manufactured by Huntingdon Fusion Techniques HFT®, the PurgEye® Desk is equipped with HFT®’s revolutionary PurgeNet™, for the in-line connection of additional accessories that allows the Weld Purge Monitor® to control welding systems based upon oxygen level as well as to provide indications of high and low oxygen levels. These include a Visual Alarm and a Dew Point Sensor.
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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.
Qwik-Freezer™, the industry standard portable CO2 Pipe Freezing System 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.
Qwik-Freezer™ kit is easy to use. A specially designed jacket is wrapped around the pipe at the point where the freeze is required. A nozzle on the jacket is then coupled to a cylinder of liquid CO2 by means of a high-pressure hose. When the liquid CO2 is injected into the space between the Qwik-Freezer™ jacket and pipe, it immediately expands to form a solid carbon dioxide (dry ice) at a temperature of -78ºC (-109ºF). This low temperature quickly freezes the contents forming a secure “ice plug” which seals the pipe.
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Low cost weld purging a variety of tubes and pipes sizes can be achieved by the use of low cost Weld Purge Film®.
Weld Purging Experts, Huntingdon Fusion Techniques HFT® recommend switching home made dams produced of unsuitable material, to their low cost Weld Purge Film® to achieve oxide free, zero colour welds.
Ron Sewell, Chairman for HFT® said: “Weld Purging can be challenging as well as expensive, which is why 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 air.”
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Reactive alloys such as zirconium and titanium present challenges to welding engineers. Many industries today are using these materials for their durability and high corrosion resistance properties, but are faced with having to avoid expensive waste and rework.
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®, who have long been acknowledged as International Leader and Manufacturer in Weld Purging Technology, have a unique, 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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To produce optimum arc stability, improve arc starting and subsequently weld quality, a dedicated Tungsten Electrode Grinder should be used for sharpening all Tungsten Electrodes during TIG welding.
Huntingdon Fusion Techniques HFT® state-of-the-art TEG-1000 Tungsten Electrode Grinder will ensure the grinding of each Tungsten Electrode results in clean and smooth finishes, with no splintering and eliminating arc jumping. The reliability of the equipment means that tip consistency is guaranteed and this is especially important with automated welding operations.
Luke Keane, Technical Sales Manager for HFT® said: “Issues often occur when Tungsten Electrodes are ground incorrectly and when it comes to TIG welding, Tungsten Electrodes are the most important part of the application.
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Some high strength steels need to be pre-heated prior to welding and may also require a post-weld heat-treatment.
Both pre- and post- weld heat treatment is necessary to prevent cracking, but temperatures up to 300ºC (572ºF) must be maintained for lengthy periods. To prevent oxidation, the inside of piping needs to be purged continuously using a specialised pipe weld purging system.
HotPurge® has been developed by International Weld Purging Specialists Huntingdon Fusion Techniques HFT®. It is an Inflatable Pipe Purging System for use with High Strength Steel Pipe Joints where pre-and post-weld heating temperatures might be as high as 300ºC (572ºF) for lengthy periods.
Manufactured in sizes 6 to 88” (150 to 2,235 mm), HotPurge® Systems can be used repeatedly for weld purging and can keep the oxygen levels below 100 parts per million (ppm) throughout the welding cycle, ensuring oxidation-free welds, without the metallurgical imperfections caused due to rapid heating and cooling.
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Welders often face difficulties when welding stainless steel T piece joints, dome end connections and closure welds, where a tandem Inflatable Pipe Purging System is unsuitable.
Weld Purge Dams from Huntingdon Fusion Techniques HFT® offer a great solution, available for pipe sizes 6 to 88” (150 – 2,235 mm).
Georgia Gascoyne, CEO for HFT® said: “Weld Purge Dams are a more effective alternative to foam or cardboard dams that are still frequently handmade by welders, which can often be unsuitable for Weld Purging. Restricting the pipe volume has proven to be the most cost effective solution and Weld Purge Dams offer a great solution where Tandem Weld Purging Systems are not practical, especially welding metals such as stainless steels, titanium and zirconium.”
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The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® have launched new Rubber PetroChem Stoppers, for pipe stopping where access is difficult.
CEO Managing Director, Georgia Gascoyne said: “Our new Rubber PetroChem Stoppers are an easy way to stop the flow of gas or liquids along a pipe or duct. Each Stopper has a longer length than diameter, which prevents them from tipping over and losing their seal inside the pipe. They are also manufactured with a ribbing to prevent slipping.”
The Inflatable Rubber PetroChem Stoppers are manufactured from high quality materials, ensuring a long life span and are resistant to a large number of chemicals and petrochemicals.
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