The Huntingdon Fusion Techniques’s (HFT) PurgExtra® enables operators to purge tube and pipe joints from 1-24” diameter.
PurgExtra allows extra argon (Ar) gas into the welding zone, helping to cool the weld zone dramatically. The extra gas also helps to remove the gases that are expelled by the outgassing, which occurs as the metal is being heated. The extra gas flow will prevent these expelled gases from combining with the hot metal and oxidising, which would otherwise cause the metal to discolour and lose its corrosion resistance and possibly introduce defects that would cause loss of joint integrity.
PurgExtra comprises of two inflatable dams connected by a heat resistant, highly flexible gas hose that has the unique IntaCal® gas release system. IntaCal allows the dams to be inflated correctly and then releases the inert gas to safely purge the space between the dams. The low profile IntaCal Valve replaces the old fashioned, bulky complicated valves and eliminates the need to make adjustments to flow rates.
The highly flexible spinal hose between the inflatable dams allows the PurgExtra Systems to be pulled or pushed easily around bends and elbows. In the centre of the spinal hose a strip of RootGlo® material is adhered, allowing the welder to see clearly through the root gap, when the system has reached the correct position in the pipe. RootGlo can be charged by exposing it to daylight for 10 minutes, after which it will provide up to 24 hours of bright illumination inside the pipe.
Luke Keane, Technical Support for HFT said, “The PurgExtra range complements the PurgElite® Series that has a single purging inlet and is appropriate for stainless steel only. PurgExtra however, 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.”