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Home / Specialty Purging Prevents Oxidation in CMV Steel Welds

Specialty Purging Prevents Oxidation in CMV Steel Welds

Available in many pipe sizes, HotPurge from Huntingdon Fusion Techniques HFT is an inflatable, specialty system designed to address the inherent challenges of keeping mechanical properties intact. Through continuous purging, it can maintain oxygen levels below 100 ppm.

Posted: February 24, 2021

Manufactured in sizes from 6 to 88 inches (150 to 2,235 mm), HotPurge Systems can be used repeatedly for weld purging
The inflatable HotPurge System incorporates RootGlo, a central band containing photoluminescent materials for easy positioning inside the pipe that is effective for up to 20 hours.
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Chromium/molybdenum/vanadium steels need to be pre-heated prior to welding and also require a post-weld heat-treatment in order to preserve the mechanical properties. These materials can also suffer from loss of elements through oxidation, thus changing alloy balance and affecting mechanical properties. Protection can be provided through the use of specially developed weld purge systems.

Huntingdon Fusion Techniques HFT has developed HotPurge, an inflatable tube and pipe purging system specifically designed for use where the temperatures may reach as high as 572 degrees F.

“Restricting the volume to be purged is always crucial when welding tubes and pipes in order to reduce the volume to be purged,” said Ron Sewell, HFT chairman. “With CMV steels, this is challenging as a pre- and post- weld heat treatment is necessary to prevent cracking. To prevent oxidation, the inside of piping needs to be purged continuously using a specialized pipe weld purging system as conventional purging systems will be unsuitable.”

Manufactured in sizes from 6 to 88 inches (150 to 2,235 mm), HotPurge Systems can be used repeatedly for weld purging and can keep the oxygen levels below 100 parts per million (ppm) throughout the welding cycle, ensuring oxidation-free welds and eliminating metallurgical imperfections caused by rapid heating and cooling.

Once positioned in the pipe and inflated with an inert gas supply, the HotPurge System seals inside the pipe with the inert gas supply displacing the oxygen from within the weld purging zone ready for pre-heating and welding. Each HotPurge System is manufactured with a Weld Purge Monitor connection for viewing the oxygen level throughout the welding process.

Each HotPurge System features PurgeGate, a revolutionary device to prevent over-inflation of, and damage to the inflatable dams. The innovative HotPurge System also incorporates RootGlo, a central band containing photoluminescent materials for easy positioning inside the pipe and that is effective for up to 20 hours.

www.huntingdonfusion.com

  • Ron Sewell wrote:

    As well as protecting the root of the weld with the Argweld® HotPurge® Systems, if you use the HFT® designed and developed Argweld® Weld Trailing Shields® on the outside, your welds will be free of oxidation from the outside as well. HFT® have been in the weld purging business for more than 45 years now, so they know what they are doing when it comes to prevention of oxidation by weld purging.

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