TUBE NEWS TN September 2017 - Page 13

The technical advantages of using water- soluble film instead of other materials include: • • • The total transparency of the film dams, allows the welder to see the weld root as it is being laid. Vapour pressure of the film is very low and does not outgas harmful elements during welding that can mix with the hot metal and cause metallurgical defects. The Argweld® Film does not contain water, like paper and sponge products do. After welding, the water-soluble film is simply washed away during the standard hydrotest cycle or by flushing of the pipe interior and dissolved down to molecular level, leaving no trace. Huntingdon Fusion Techniques HFT® have a worldwide Exclusive Distributor network, which can be found at: . TUBE NEWS September 2017 13