Types of Nondestructive Testing

Types of Nondestructive Testing

Liquid Penetrate Testing (PT)

Liquid Penetrant Testing is sometimes called dye penetrant testing (DPI) or liquid penetrant inspection (LPI). One of the most cost effective ndt methods used to test non-ferrous materials. This method locates surface defects in nonporous materials when you apply a fluorescent or non-fluorescent dye penetrant to the surface. This method can detect cracks, fatigue cracks, forging and casting defects.

Magnetic Particle Inspection (MT)

Common ndt method that is capable of detecting surface and subsurface defects in ferrous materials. The method involves the induction of a magnetic field to or around the test specimen. If the material has a surface or near surface flaw it will create magnetic flux. These magnetic fluxes will attract small magnetic particles to the flaw area making it detectable. Also known as Magnetic Particle Inspection (MPI)

Radiographic Testing (RT)

This ndt inspection method uses wavelength electromagnetic radiation to penetrate various materials to detect flaws. This x-ray detection can be used on lead and steel to detected external and internal flaws but cannot be used on plastics. Radiation Safety is very important when using this testing method due to the possible exposure to strong gamma sources in remote sites.

Eddy Current Testing (ET)

Eddy current testing uses electromagnet induction in conductive materials to detect flaws. This method can detect very small flaws in or near the surface of the material. It is limited to conductive material and the surface must be accessible.

Ultrasonic Testing (UT)

Ultrasonic testing takes place when you send short ultrasonic pulse-wave into the material to detect internal flaws or identify different types of material. This method is also commonly used to determine the thickness of material. UT testing can be used on alloys, steel, concrete, wood and composites.

Visual Inspection Testing (VT)

Visual Inspection is the most common and readily available inspection. It is the process of eye fixations on a test specimen. Many times the inspector is trained to look for certain clues that might indicate defects or flaws. Most ndt inspections start with a visual inspection.