Smarter weld purging

Louise Davis

Monitoring the oxygen level before, during and after welding is essential.

Welding in an environment of less then 100ppm for stainless steel and less than 20ppm for titanium ensures that welds are free from oxidation.

Allowing joints to oxidise when welding then involves mechanical or chemical oxide removal to prevent to loss of corrosion resistance at best and metallurgical imperfections at worst.

Oxidation can be prevented by using a Weld Purge Monitor to verify purge quality prior to the commencement of welding.

Now, Weld Purge Monitors are available with PurgeNet, a networking device which is manufactured as standard to five of the PurgEye Monitors manufactured by Huntingdon Fusion Techniques HFT.

PurgeNet is used for communicating the current oxygen reading from a PurgEye Weld Purge Monitor to another piece of equipment, such as the visual warning accessory PurgeAlarm or a Dew Point Monitor with additional inter-pass temperature monitoring.

PurgeNet controls HFT’s new PurgeAlarm. This IP66 Rated (Environmental Protection) Visual Alarm connected to PurgeNet displays a red indicator when the oxygen level is reading a greater value than the alarm threshold set by the user.

An optional green indicator can be fitted above the standard red indicator and will illuminate only if the alarm is active and reading a value lower than the alarm threshold set by the user.

A sounder is available as an option to provide an audible alarm instead of a light.

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