Manual Phased Array (MPA) is an advanced ultrasonic inspection technique that allows versatility in controlling the angle and focusing of the ultrasonic beam. In the hands of a skilled operator it has the capability to detect subsurface defects in components that are difficult or impossible to inspect using other techniques. MPA has not been used for these components in National Grid, and from discussions with inspection experts it does not seem to have been used for this elsewhere despite it having the potential to be successfully employed. This project will investigate if the technique can be used for inspection of welds on small offtake branches in the geometries typically used by National Grid.
The objectives of this project are to determine if MPA can be used to detect the presence of subsurface defects in the fillet and butt welds of small diameter branch offtakes, and if so, to develop the method into a fully specified practical technique.