Welding of vacuum tubing and piping
PUBLISHED: 08 Dec 16
PurgElite® Tube and Pipe Purging System
Welds in tubing and pipework for vacuum systems should have many important characteristics. They ideally need to be manufactured from stainless steel, leak tight, the joints should have full penetration with excellent sidewall fusion, there should be no porosity and the finish should be free from oxidation and discolouration.
When welding these stainless steel tubes and pipes, it is important to purge the welding zone with an inert gas, usually argon, to prevent loss of corrosion resistance, oxidation, discolouration, metallurgical defects and to ensure a good internal weld profile.
After 40 years of innovation, design and manufacturing expertise in the field of tube and pipe weld purging, Huntingdon Fusion Techniques HFT® has introduced PurgElite®, a range of low cost Tube and Pipe Purging Systems to achieve a clean, oxide free, zero colour weld in such tubes and pipes. As well as vacuum tube and piping, PurgElite® can be used in any other industry where stainless steel or titanium is used.
Georgia Gascoyne, CEO for HFT® said: "We recently had a customer who was wasting a lot of money in time and inert gas costs by filling entire pipework systems with argon in order to weld the stainless steel pipes in an inert environment. There were several 90° bends in the pipework, so the customer thought filling the whole pipework system with expensive argon gas, was the only option."
"To save welders the expense of completely filling tubes and pipes with an inert gas, PurgElite® Systems with their double inflatable dams are available, manufactured to suit pipe diameters from 1" to 24" (25 to 600 mm)."
PurgElite® is manufactured with a special spinal tube, joining the two dams, that is resistant to hot metal up to 300°C (572°F) and is super flexible to allow movement around 90° bends. These pipe weld purge systems are made of low outgassing rate materials, which gives them the ability to produce the right environment for high quality welds.
IntaCal®, a purge gas feed device means there is no complicated valve to set. To ensure the PurgElite® System can be positioned accurately inside the tube or pipe, a centrepiece glow positioning indicator RootGlo® comes as standard on all sizes.
HFT®'s innovative PurgeGate® valve is available as an accessory, a unique one way valve suitable for all types of Inflatable Pipe Weld Purging Systems. PurgeGate® regulates the gas flow and pressure during welding to ensure the inflatable dams don't burst resulting in a failed weld.
Heat Resistant Covers are available as accessories to protect the inflatable dams in the event that the weld process is unusually hot. These covers suit any inflatable purging or blocking system and are held onto each dam by a number of ties. Such covers allow use up to a temperature of 300°C.
There are many fabricators still using poor quality home made devices fashioned from foam, wood, metal and rubber. They are wasting vast amounts of money on expensive argon gas and labour by allowing their welders to continue in their old, often ineffective ways.
By using PurgElite® Tube and Pipe Purging Systems, companies can save significant money in both time and inert gas costs. Contact HFT® for a live demonstration and return on investment charts.
Watch the PurgElite® demonstration video, available at: https://youtu.be/Q-dSRpPvd1s
Weld Purge your heat-treated pipes with HotPurge®
Low cost weld purging with Weld Purge Plugs™
Highly accurate 100 ppm Weld Purge Monitor for welding stainless steel
Inflatable Welding Enclosures provide low cost argon gas shielding environment
Cost effective pipe repairs with Accu-Freeze™
Tube and pipe weld purging costs paid in one weld with PurgExtra®
Eliminate thoria by switching to MultiStrike® for safer welding
Inert shielding gas monitor for stainless steel welding
Ensure your Pipe Purging System doesn't burst with PurgeGate®
Safe, fast and low cost pipe freezing with Qwik-Freezer™
Glass fibre Backing Tape gives improved weld root profiles
Special high quality, leak tight welding hose for argon feed
Tight sealing Low Profile Pipestoppers for limited spaces and restricted access
Huntingdon Fusion Techniques HFT® to Exhibit at World Nuclear
Lightweight aluminium plugs for heavy-duty applications