Question 1

What are the 6 main NDT methods?

Accepted Answer

The six main NDT methods are: Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), Liquid Penetrant Testing (PT), Eddy Current Testing (ET), and Visual Testing (VT). Each detects different defect types in different materials.

Question 2

Which NDT method is best?

Accepted Answer

No single NDT method is 'best' — each has strengths. UT excels at finding internal flaws in thick sections, RT provides permanent film records, MT detects surface cracks in ferromagnetic materials, PT finds surface cracks in any material, ET detects surface defects without contact, and VT is the first line of inspection.

Question 3

What is the most common NDT method?

Accepted Answer

Ultrasonic testing (UT) is the most widely used NDT method globally, followed by radiographic testing (RT). UT is preferred for its portability, no radiation hazard, and ability to measure thickness and detect both surface and subsurface defects.

NDT Methods