NDT Quick Guide

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NDT Quick Reference Guide

A guide to assess which of the commonly performed non-destructive tests are fit for your needs

There are unique exceptions to each test, but this guide details the generally accepted capabilities of each test.
If you have any questions, please call us at 248-597-0089.

Inspection Ferrous Non-Ferrous Surface Crack Detection Sub-Surface Crack Detection Porosity Shrinkage Thickness, Hardness, or Void
Magnetic Particle Inspection (MPI)

Induces magnetic fields into ferromagnetic materials to detect flux leakage.

Yes No Yes Near-Surface
(depth of 0.1”)
Yes Yes No
Dye Penetrant Inspection (DPI)

Locates fine cracks by letting a fluorescent dye accumulate in discontinuities.

Yes Yes Yes No Yes Yes No
Ultrasonic Inspection (UT)

Transmits sound waves through a part in order to evaluate results on an oscilloscope.

Yes Yes Yes Yes Yes Yes Thickness
Radiography Inspection (X-Ray)

Transmits x-ray or gamma rays through a part to detect sub-surface discontinuities.

Yes Yes (except Lead) No No Yes Yes Void
Eddy Current Inspection (EC)

A coil induces eddy currents into parts and measures resulting impedance / distortion.

Yes Yes Yes Near-Surface
(depth of ~2 μm)
No No Hardness
Hardness Testing

Applies a fixed load and measures the depth of penetration.

Yes Yes No No No No Hardness

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