Welders often face weld purging difficulties when working under the conditions experienced on-site including exposure to extremes of heat and cold, harmful sand and dust and even hazardous fumes, where an expensive Weld Purge Monitor® may not always be ideal.
Huntingdon Fusion Techniques HFT® have designed and developed the PurgEye® Site, which is manufactured inside a protected secure, safe, waterproof and dustproof, tough carry case, perfect for on-site welding.
Georgia Gascoyne, CEO for HFT® said: “Welding on-site does not eliminate the need to measure oxygen levels when welding metals such as stainless steel, zirconium and titanium. Often, welders are left to guess at purge levels, due to some Weld Purge Monitors® not being able to handle various on site conditions.”
Pipe stopping where access is tight can pose challenges for when duties such as repair work, leak testing and weld purging are required.
Pipestoppers®, a Division of Huntingdon Fusion Techniques HFT® design and manufacture a Range of Mechanical and Inflatable Pipestoppers® and Plugs to suit a variety of applications.
Ron Sewell, Chairman at HFT® said: “The Low Profile Stopper can fit into a pipe end that may be directly on an elbow or just inside a flanged neck on a casting. Other applications include blocking pipe ends to keep gases inside or to keep debris and vermin out.”
“When used in a vertical mode, these Low Profile Stoppers have already been used to prevent machine swarf or tools from falling into pipes, into an unrecoverable and dangerous situation, in a nuclear power steam turbine.”
Weld Purging large diameter pipework made from stainless, duplex and chrome steels, titanium or zirconium can be expensive, with requirements to have the oxygen level well below 100 ppm during the welding cycle.
As it is not cost effective to completely fill pipework with expensive inert gas, Huntingdon Fusion Techniques HFT® have developed QuickPurge® Systems to dramatically reduce the space that needs to be purged.
Ron Sewell, Chairman for HFT® said: “Welders can often spend up to half a day purging pipes, which will cost a considerable amount in time and gas costs. With the help of QuickPurge®, large diameter pipes can be purged down to 100 ppm ready for welding in just a short time. The dramatic savings in time and argon pay for the system in just one weld!”
Protecting titanium and stainless steel welds from coming into contact with air whilst they cool prevents oxidation, weld defects and rework.
Leaders in Weld Purging Technology, Huntingdon Fusion Techniques HFT® have launched their re-designed Weld Trailing Shields®, which provide an additional inert gas coverage during welding, preventing the hot metal from coming into contact with air while it cools.
CEO Managing Director, Georgia Gascoyne said: “Along with the new sleek design, our Trailing Shields® have a NEW Unique clip design, which means the welder can interchange different trailing shield sizes without having to change the welding torch.”
Companies currently facing system downtime can drastically reduce pipe and valve repair and maintenance costs with Accu-Freeze™ available from the Pipestoppers® Division of Huntingdon Fusion Techniques HFT®.
Georgia Gascoyne, CEO for HFT® said: “Pipe freezing is a simple and efficient way of sealing a pipe or system while pipe repairs or general pipework maintenance is carried out, without the need to drain the system.”
Accu-Freeze™ works by reducing the pipe fluid to a temperature below its freezing point and developing a freeze plug. This controlled method of pipe freezing uses liquid nitrogen (LN2) to freeze stationary liquids in a section of pipe or tubing. The nitrogen is passed through a coil surrounding the pipe producing a frozen plug inside and hence preventing flow through the part to be removed.
Single Ended Inflatable Dams are readily available in a variety of shapes and sizes for a range of applications including sealing, blocking, pressure testing and isolation.
Pipe stopping equipment from the Pipestoppers® Division from Huntingdon Fusion Techniques HFT® gives the user the opportunity to isolate a section of pipeline to carry out repair and maintenance work.
Luke Keane, Technical Support Manager for HFT® said: “We design and manufacture a range of standard and non-standard Inflatable Stoppers for tanks, chambers, tubes, pipes and pipework fabrications, offering a range of pipe stopping and blocking requirements for a variety of sealing problems.”
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.”
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.”
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.
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.