Weld purging system designed for use with heat-treated pipes

March 20, 2017

Huntingdon Fusion Techniques HFT® has developed HotPurge®, an inflatable pipe purging system for heat-treated chrome and high-strength stainless steel pipe joints that might stay at temperatures as high as 1,400 degrees F for many hours.

Available from Cob Industries, the system allows the purge to be safely continued for up to 24 hours during preheating, welding, and postweld heat treating, with the purge system remaining in place.

The inflatable dams maintain an even seal throughout the weld cycle, regardless of pressure rises or excessive flow rates of argon gas. The large central collar reduces the space to be purged. The PurgeGate® device prevents too much airflow to the inflatable dams.