Technical Data and Specification

Weld purging bladders, purge dams, back purge, purge and weld, huntingdon fusion

Size Range 6 to 88" (152 to 2,235 mm)

Manufactured for pipe diameters from 6 to 88 inches (152 up to 2,235 mm), these lightweight systems are easy to inflate using the purge gas and are heat resistant up to 90ºC (194ºF).

The Argweld® Weld Purge Dams are manufactured from the same material as our range of QuickPurge® Inflatable Tube and Pipe Purging Systems, which are rugged and can be used time and time again.  

Leak tightness

Once the Dam is inflated and seals all around the internal circumference of the pipe, the excess inert purge gas spills out and purges the space around the weld joint, which then pushes the air (oxygen) out into the open atmosphere.

Proper Use

Each Dam is equipped with a purge/inflation hose (black), an extra purge gas hose (blue) as well as an exhaust hose for connecting a Weld Purge Monitor® (red).

The blue hose is suitable for passing extra gas into the weld zone at any time to cool welds and meet interpass temperature specifications, or to provide extra inert gas in the event of titanium, zirconium or special stainless applications needing a guaranteed zero colour weld.

Four pull tags are located around the circumference of the Weld Purge Dam, so rope, pull wires or slings can be attached for retrieval of the deflated system, if required. 

By producing bright shiny welds, there will be no porosity and no loss of corrosion resistance caused by oxidation.


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