Non-destructive testing (NDT) refers to testing methods which do not cause any destruction to the material that is being tested. These techniques are generally used for testing the external or internal problems of a system or machinery or a product but does not interfere with the way it functions or operates in future.
There are various methods used for these tests. Some of them are as follows –
Magnetic Particle Inspection or Testing – This type of testing is mostly done in case of iron or steel products and systems, or any other materials having ferromagnetic properties. If there is any flaw or distortion in the subsurface or surface of the material then it becomes visible due to the process involved in this kind of testing. Distortions can be in the form of cracks or holes or anything which is very difficult to detect with naked eyes.
Dye or Liquid Penetrant Inspection – Compared to other testing methods, this is less expensive. This testing method is generally applied to materials which are non-magnetic and non-ferrous. These may include items which are ceramic or made of plastic. The dye that is used is generally oil of very fine quality and thin texture. It is usually bright red or fluorescent ultra-violet in color. The material to be tested is cleaned and then the process is applied. Any cracks or flaws can be detected because the dye penetrates that area and makes it visible.
Ultrasonic Testing – This testing method is used in transportation industries, like automotive, aerospace and many others sectors. Sound waves of high frequency are used to find out any problems in the properties of the materials used in the product. The thickness of an object can also be tested with this method, especially if that object is accessible from only one end.
Radiographic testing – This kind of testing is suitable for detecting any kind of internal flaws or defects of non-ferrous and ferrous metals and other materials. The method involves the usage of a radioactive isotope or an x-ray device as the radiation source, which is passed through the material being tested. A digital device of film captures the process. This film is then processed to get an image, whose density can be variable. The changes in the density indicate the probable imperfections.
Hardness Testing – This is mostly used in metallurgy sector and in the fields of engineering. Scleroscope is a commonly used instrument for this method.
Infrared Testing – Thermography, measurement cameras and infrared imaging techniques are mostly used for infrared testing. These are used to detect if the object that is being tested is emitting any form of infrared energy.
Visual Inspection – One of the oldest types of non-destructive testing services is the visual testing method. The material that needs to be tested is scanned thoroughly to find out any kind of defects or flaws that might be present on its exterior surface. Sometimes cameras and video equipment are used as well for the process.
The non-destructive testing techniques are particularly well-known in certain locations, like the NDT services at Edmonton. The efficiency of these testing methods is giving them a wider consumer base, and, their effectiveness is helping in facilitating the rapid growth of various industrial procedures.