Table 1: IGSCC sizing by different ultrasonic techniques

* Known depth, used for reference

Sr. No. Depth of IGSCC measured by metallography (mm) Depth of IGSCC estimated using 10% deep notch standard (mm) Depth of IGSCC using known depth IGSCC as reference standard (mm) Depth of IGSCC estimated using tip diffraction technique (mm)
1 7.7 2.4 7.7* 7.7
2 6.7 2.1 4.8 6.6
3 7 1.5 3 7
4 4.3 1.9 3.2 4.9
5 5.8 1.2 2.4 5.6