NON DESTRUCTIVE TESTING SERVICES

Magnetic particle testing (MT) is a non-destructive testing method frequently used to detect surface and subsurface defects in ferromagnetic materials. Ferromagnetic is defined as a term used for materials that can be magnetized by a magnetic field or strongly attracted by a magnetic field. Magnetic particle testing (MT) is fast and relatively easy to perform, and surface preparation is not as critical as other NDT methods. The most important limitation is that the material being inspected must be made of a ferromagnetic material such as iron, nickel, cobalt, or one of their alloys.

Liquid penetrant testing (PT) checks material defects exposed to the surface by flowing special penetration liquids into the defect and drawing the liquid with the developer. There are two types of penetrants; fluorescent or color contrast (dye) penetrant. These can be used with any of three intermediate cleaning methods – washed with water, post-emulsified and removed with solvent. The dye penetrant method (color contrast) requires sufficient visible light to provide appropriate examination conditions, while the fluorescent penetrant method must be used with ultraviolet or “black light” in dark conditions.

It is a Non-Destructive Testing (NDT) method that uses high-frequency sound waves to detect surface and subsurface discontinuities in the inspection piece. Ultrasonic Testing (UT) uses high frequency sound waves to perform inspection and measurement. Ultrasonic inspection can be used for defect detection/evaluation, dimensional measurements, material characterization and much more. When there is a discontinuity (such as a crack) in the wave path, some of the energy will be reflected from the defect surface. The reflected wave signal is converted into an electrical signal by the transducer and displayed or recorded in various ways.

Visual testing (VT) is the oldest and most common non-destructive testing (NDT) technique. It is often the first step in the examination process before starting other NDT methods. Compared to other techniques, visual testing is low-cost, easy to perform, and generally eliminates the need for other types of testing. Mechanical or optical aids may be required to perform visual testing.

Before using any mechanical or optical aids, the sample must be well illuminated and its surface cleaned.