Weld Purging gas pressure is a subject that raises its head fairly frequently.
Welders are used to lowering the weld purge flow rates in pipe purging when they are approaching the end of a weld, to avoid blowing out the root as the weld closes and to avoid concavity as another problem.
The PurgEye® 500 Weld Purge Monitor® can assist greatly in preventing blow out and concavity.
This instrument has an internal electronic pump. If the pump is started and the gas flow is adjusted until there is just a tiny flow from the vent pipe, this will minimize the pressure in the weld cavity and eliminate the blow out and concavity problems.
