Below is a chart showing the recommended test method for detecting the specified discontinuity.
| NDT Test Method | ||||||||||
| AE | ET | IR | LT(8) | MI | MT(11) | PT(1) | RT | UT | VT(12) | |
| General | ||||||||||
| Surface Cracks | G | G | F | G | U | G | G | F(3) | G | F |
| Internal Cracks | G | U | F(4) | U | F | G | U | |||
| Voids | G | U | G | G | G | F(1) | ||||
| Thickness | U | U | U | G(10) | G(9) | G(2) | ||||
| Metallurgical variations | G | U | G | F(6) | U | F(5) | F(10) | U | ||
| Sheet & Plate | ||||||||||
| Thickness | U | U | U | U | G(10) | G | G(2) | |||
| Laminations | U | U | U | G | U | G | F(1) | |||
| Voids | G | U | P | G | G | G | G(1) | |||
| Bars & Tubes | ||||||||||
| Seams | G | F | U | G | G(7) | P | G | F-G | ||
| Pipe | U | U | U | P | G | G | G | F | ||
| Cupping | U | U | U | P | G | G | F | |||
| Inclusions | G | P | U | G | G | F | G | G | ||
| Castings | ||||||||||
| Cold Shuts | G | U | G | G | F | F | ||||
| Surface Cracks | G | U | G | F | F | |||||
| Internal Shrinkage | U | U | G | U | ||||||
| Voids, pores | U | F | G | F | ||||||
| Core shift | U | U | G | G | ||||||
| Forgings | ||||||||||
| Laps | U | G | G | P | G | |||||
| Inclusions | U | F | G | F | F | |||||
| Internal Bursts | U | U | U | G | U | |||||
| Internal Flakes | U | U | U | P | U | |||||
| Crack & Tears | U | G | G | F | F | |||||
| Welds | ||||||||||
| Shrinkage Cracks | U | G | G | |||||||
| Slag Inclusions | U | G | G | |||||||
| Incomplete Fusion | U | G | G | |||||||
| Incomplete Penetration | U | F | G | G | ||||||
| Pores | U | P | G | G | ||||||
| Tungsten Inclusions | U | P | G | |||||||
| Processing | ||||||||||
| Heat-treat Cracks | U | G | U | |||||||
| Grinding Cracks | U | G | U | |||||||
| Service | ||||||||||
| Fatique & heat Cracks | U | G | F | |||||||
| Stress Corrosion | U | P | F | F | ||||||
| Blistering | U | P | ||||||||
| Thinning | U | U | F | G | ||||||
| Corrosion pits | U | F | F | G | ||||||
| NDT Test Methods Legend | ||||||
| AE= | Acoustic Emission | |||||
| ET= | Eddy Current | |||||
| IR= | Infrared | |||||
| LT= | Leak Test | |||||
| MI= | Material Analyser | |||||
| PT= | Penetrant | |||||
| RT= | Radiography | |||||
| UT= | Ultrasonics | |||||
| VT= | Visual Testing | |||||
| Detectability with Method Legend |
F=Fair |
G=Good |
U=Unsatisfactory |
| NOTES: | |||||||||||
| (1) All indications must be open to the surface. | |||||||||||
| (2) Need additional measuring gages | |||||||||||
| (3) Beam must be parallel with crack axis. | |||||||||||
| (4) Must be near surface. | |||||||||||
| (5) May detect if material density changes. | |||||||||||
| (6) May detect if material composition changes. | |||||||||||
| (7) May require higher sensitivity penetrant. | |||||||||||
| (8) Indiciations must be through-wall | |||||||||||
| (9) Surface must be fairly parallel | |||||||||||
| (10) Standard required to detect or measure | |||||||||||
| (11) Indications must create adequate interruption to magnetic field | |||||||||||
| (12) Magnification may be required |