DGS-AVG Technique for Defect Sizing

The DGS-AVG technique (Distance Gain Size – Abstand Verstärkung Größe) is one of the most widespread methods for sizing defects detected by ultrasound in welds. It rests on theoretical curves that relate the echo distance, the instrument gain and the equivalent size of a flat reflector.

In this section we bring together articles explaining how to use DGS-AVG with Dakota flaw detectors and how it fits into inspection procedures to AWS D1.1 and other industry codes.
Dakota instruments with DGS-AVG curves

Dakota FX70-DL — portable flaw detector supporting DGS-AVG curves.
Dakota FX81-DL — benchtop version with dedicated software.

Further reading on flaw detection
AWS D1.1 ultrasonic weld inspection · AWS D1.1 weld inspection with the Dakota FX70-DL · FX70-DL vs FX81-DL compared

To qualify a UT procedure with DGS-AVG curves on Dakota flaw detectors, contact the RODER team.