Purging System Gives Oxide-Free Welds


Leading the way in Weld Purging Technology, the PurgExtra purges tube and pipe joints from 1 to 24-in. diameter that provides an extra gas purge hose to speed up the purging process even further.


Additional advantages of this design improvement are that the operator can use the extra purge gas supply for welding reactive metal joints such as those made from titanium and zirconium. In addition, the extra gas can be used for cooling welded joints faster than normal, where permissible.


When welding joints where interpass temperature control is necessary, PurgExtra allows extra argon 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 oxidizing, which would otherwise cause the metal to discolor and lose its corrosion resistance and possibly introduce defects that would cause loss of joint integrity.


PurgExtra comprises 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 adjust 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 center 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.


The innovative PurgeGate Valve may be fitted to the PurgExtra Systems as an accessory, to protect the inflatable dams from bursting due to accidental over pressurization.


Heat Resistant Covers are also available for PurgExtra, which fit onto the inflatable dams and allow operation with pre-heated and post-weld heat-treated pipe joints where the temperatures might reach 760°C.


The HFT Weld Purge Monitors are used to give precise oxygen values throughout the purging process.

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