| Ultrasonic | - Suitable for surface and subsurface defects
- Sensitive to small defects
- Immediate test results
- Little part preparation
- Wide range of material thickness can be inspected
| - Surface of part to be inspected must be accessible to sonic probe
- Rough surfaces interface with test results
- No permanent test records
- Test method is directional depending on sound beam defect orientation
- High degree of skill and experience required to set up and interpret results for varied test conditions
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