Comparing NDT Methods

What this topic covers

Compare what visual, penetrant, magnetic, ultrasonic, radiographic and eddy-current methods can observe.

Core testing ideas

Surface and volumetric methods answer different questions.

Material limitations and access can rule out otherwise attractive methods.

Method combinations should be chosen around credible defects, not technology novelty.

Measurement and method limits

Method capability depends on material, geometry, access, surface condition, calibration and operator competence.

Evidence and traceability

Indications require interpretation and comparison with approved acceptance requirements.

Using the result

Hazardous radiation, pressure, chemicals and machine-operation details are intentionally excluded.