Purge the welding zone

Louise Smyth

When welding stainless, duplex, chrome steel and titanium tubes and pipes, it is important to purge the welding zone with an inert gas to prevent corrosion, oxidation, discolouration and to ensure a good internal weld profile with no metallurgical defects.

Now 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.

To save welders the expense of completely filling tubes and pipes with an inert gas, PurgElite Systems are available, manufactured to suit pipe diameters from 1-in to 24-in (25 to 600 mm). PurgElite is manufactured with a special spinal tube that is resistant to hot metal up to 300ºC (572ºF) and is super flexible to allow movement around bends. These spinal tubes are made of low outgassing rate materials, so there is no risk of weld contamination.

Each PurgElite features IntaCal, a purge gas feed device, which means there is no complicated valve to set. A centrepiece glow positioning indicator RootGlo comes as standard to ensure the system can be positioned accurately inside the tube or pipe. In addition there is no metal braiding on the PurgElite, which could be welded to the root of a joint.

HFT’s 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 weld purging to prevent the dams from over inflating.  

Quick connect/disconnect fittings with collets and ‘O’ ring seals for gas tight sealing, fitted with anti-release circlip are fitted to all systems to prevent parts accidentally separating inside pipes.

Heat Resistant Covers are available as accessories to protect the inflatable dams, which are held on with ties and have a temperature rating of up to 300ºC.

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