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Thursday, 15 October 2020 06:49

Pipe Purging with Water-Soluble Weld Purge Film®

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When it comes to pipe purging, it is not desirable, nor cost effective to simply pour inert gas into the pipe assembly in the hope that a good purge is achieved. A tough, leak tight purging barrier is required.

To keep purging costs down, Weld Purging Experts, Huntingdon Fusion Techniques HFT® have designed and developed Weld Purge Film®, a water-soluble polyvinyl acetate purging barrier for a variety of pipe sizes.

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Luke Keane, Technical Sales Manager for Huntingdon Fusion Techniques HFT® said: “It is so easy to cut a circle of water-soluble film and place it a short distance away from the root gap before welding, pasting in place with the Argweld® Water Soluble Super Adhesive® to ensure a tough leak tight barrier, keeping the purging volume to the barest minimum. Argweld® Weld Purge Film® offers users the opportunity to make significant economies by minimising gas usage and cutting down dramatically on time taken to make a purge, whilst at the same time, achieving a desirably low oxygen level.”

After welding, the water-soluble film can be dissolved and washed away by simply flushing of the pipe interior. Previously, pipe welders might have used water-soluble paper, but as paper contains a high percentage of water which undesirable to have near a weld, the Argweld® Weld Purge Film® is a tremendous new benefit for weld purging.

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These affordable kits will save operators high costs by minimising gas usage, reducing purge time and eliminating the need for cleaning. Weld Purge Film® Kits have been designed and developed by HFT®, as a complete accessory to manufacture dams that offer effective shielding and stability.

Huntingdon Fusion Techniques HFT® have a worldwide Exclusive Distributor network, which can be found at

Made in Wales ‘Manufacturer of the Year’ and Welsh Business Awards – Exporter of the Year.

Huntingdon Fusion Techniques HFT® are Weld Purging Innovators, Designers and Manufacturers with offices located globally.

Huntingdon Fusion Techniques HFT® invented the ‘Weld Purge Monitor®’ in 1975 and own all international intellectual property rights and registered trademarks.  

Weld purging is the act of removing, from the vicinity of the joint, oxygen, water vapour and any other gases or vapours that might be harmful to a welding joint. Such gases may combine with the metal to form undesirable compounds that may reduce corrosion resistance or may be instrumental in creating cracks or other structural defects in metals.

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