Ultrasonic Inspection (UT)

Ultrasonic Testing utilises high-frequency sound waves to inspect the internal structure of a material. Ultrasonic waves are sent into the material, and reflections are analysed to identify flaws. UT is versatile and can be used for thickness measurements, flaw detection, and characterization of defects. UT is best used to detect internal planar defects and verify material thickness. UT can be used on most materials.


• Portable (on-site and in-house).
• High penetrating capability.
•Quick instant results.
•Thickness gauging can be carried out through surface paint.

What defects/indications can it detect?

• Corrosion or thinning (known as ‘thickness gauging’).
• Inclusion/laminations. Internal planar defects (such as lack of fusion).
• Cracks and voids.

Commonly used to test

• Storage tanks.
• Forgings & castings.
• Pressure vessels.
• Welds in high pressure environments.
• Structural steel welds.


• Uses a flammable liquid.
• Power may be needed.
• Temperature dependent.
• A clean surface is required before inspection.

Alternative inspection methods

• Radiography (RT).
• Phased Array Ultrasonic Testing (PAUT).