HUNTINGDON Fusion Techniques, represented in Australia by Perfect Welding Products , has released Argweld heat resistant pipe purging systems. They allow for the welding of high-temperature applications or welding in high-temperature conditions.
The purging systems are designed for materials whose pipe joints and adjacent areas need to be heated before and after welding in order to avoid cracking. Materials like P91 chrome steel are used in high-stress, high-pressure applications and must be purged throughout the welding process to prevent coking and notches. This system enables fabricators to purge pipes in temperatures of 300ºC for up to 24 hours.
The system is comprised of two inflatable dams connected by a flexible argon gas pipe. The whole system is covered in heat-resistant material, while the spinal hose is covered with bonded, preformed mineral wool. Models are available from 101.6mm upwards, with a range of 12mm.
By localising the volume to be purged, fabricators benefit from decreased waiting time and shielding gas costs, while the effective elimination of atmospheric gases ensures smooth and even penetration beads on all pipe joints.