Non-destructive testing (NDT) is widely used for quality control in
the fabrication of process plant and equipment. It is a set of
techniques used to evaluate the structural integrity of materials and
detect any flaws that can compromise their safety or functionality.
Here are five of the most common NDT methods in use today.
Liquid Penetrant Testing – Liquid penetrant testing is one of the simpler methods used to detect defects in material. When a liquid dye penetrant is applied to a surface, it is drawn into any surface cracks or voids, thereby highlighting visible breaks in the structure.
Electromagnetic Testing – Electromagnetic testing is a category that includes Eddy Current Testing, Alternating Current Field Measurement and Remote Field Testing. These techniques can detect both surface and sub-surface flaws. Tests induce an electric current or magnetic field in the material and any defect creates a measurable response.
Magnetic Particle Testing – Magnetic particle
testing is widely used for detecting surface and near-surface flaws in
ferromagnetic materials. The material to be tested is magnetized. The
air gaps from any defects on or near the surface cause leakages in the
magnetic flux. Iron particles spread on the surface will be attracted to
outline each crack and facilitate detection.
Ultrasonic Testing – Ultrasonic testing enables detection of deep and extremely small flaws within the material. With this method, a transducer generates ultra-high frequency sound waves through the material. When a discontinuity such as a crack or any other imperfection is encountered, part of the sonic energy is reflected. It is then measured and displayed on a screen.
Thermal Infrared Testing – Thermal infrared testing, or infrared thermography, measures and maps differences in temperature on the surface of a material using thermal imaging devices. Minute changes in temperature can be measured to detect cracks, inclusions or voids.
Here are five of the most common NDT methods in use today.
Liquid Penetrant Testing – Liquid penetrant testing is one of the simpler methods used to detect defects in material. When a liquid dye penetrant is applied to a surface, it is drawn into any surface cracks or voids, thereby highlighting visible breaks in the structure.
Electromagnetic Testing – Electromagnetic testing is a category that includes Eddy Current Testing, Alternating Current Field Measurement and Remote Field Testing. These techniques can detect both surface and sub-surface flaws. Tests induce an electric current or magnetic field in the material and any defect creates a measurable response.
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Ultrasonic Testing – Ultrasonic testing enables detection of deep and extremely small flaws within the material. With this method, a transducer generates ultra-high frequency sound waves through the material. When a discontinuity such as a crack or any other imperfection is encountered, part of the sonic energy is reflected. It is then measured and displayed on a screen.
Thermal Infrared Testing – Thermal infrared testing, or infrared thermography, measures and maps differences in temperature on the surface of a material using thermal imaging devices. Minute changes in temperature can be measured to detect cracks, inclusions or voids.
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