Weld Purging is the act of removing oxygen from the vicinity of a weld before, during and after welding. The weld zone is usually confined, with the oxygen level being monitored to ensure it is reduced to a level where welds and their heat affected zones will not be affected by oxygen, leading to loss of corrosion resistance properties. For stainless steel, this is usually lower than 100 parts per million (ppm).
In order to measure the oxygen content, a Weld Purge Monitor® is used, avoiding the need to guess when the oxygen level is low enough to begin welding. The PurgEye® 100 IP65 Weld Purge Monitor®, designed and manufactured by Weld Purging Experts Huntingdon Fusion Techniques HFT® is available at a low cost, ensuring oxide-free, zero colour welds are achieved time after time.
A customer in the UK said: “When working with medium to large diameter exotic pipework, using the PurgEye® 100 can prevent you from having a very bad day! Previously, I only ever used the older model and the introduction of the PurgEye® 100 was a godsend. Anyone, from the welder who has had to carry out weld repairs due to root weld oxidisation (or coking) on such materials, to the directors facing an expensive bill for re-work and possible tarnished company reputation, to the client with their project now running behind schedule, will know exactly what I mean. Weld Purge Monitors® are a necessity.”
The PurgEye® 100 is IP65 rated and comes with leak-tight push buttons, auto calibration features, vacuum-sealed leak-tight probe assembly, wrist/neck strap and tripod mount.
The extra long life sensor provides approximately 18 months life before it requires changing. A low sensor indicator will appear on the screen, warning that a new sensor is required. Once that icon appears, it provides the user with adequate time to obtain a new sensor, which can be fitted like changing a battery and the monitor can be re-calibrated easily by the user.
The PurgEye® 100 has a clear, easy to read LCD screen, with a 24 mm high display. The display also shows a low battery icon. When the monitor is not in use, an automatic sleep mode activates to conserve battery life.
The Weld Purge Monitor® was invented by HFT® in the 1970’s and with over 40 years of innovation, design and manufacturing experience, the company now has a Family of PurgEye® Weld Purge Monitors® to measure oxygen levels from atmospheric content (20.94%) down to 1 ppm (accurate to 10 ppm).