Non-destructive testing is a form of inspection that allows the inspection of the material or part to be examined without damaging the properties required for its intended use, without damaging, damaging its integrity and, if necessary, inspection of the whole. The validity of such an examination is based on the results of previous destructive tests and examinations.
Non-destructive inspection studies can easily determine the origin of defects in the material or part and correct the defects at the beginning of production. The reliability of the material produced in this way is increased.
There are several different non-destructive testing methods. A good knowledge of these methods will allow a more reliable examination of the internal structure of the material. When non-destructive testing is carried out, there is no trace or damage to the material. As such, non-destructive testing methods are only applied to finished materials or parts. As a result of the test and inspection, it is determined whether the material or part is faulty.
Non-destructive testing methods are used for other purposes as well as investigating invisible defects in parts or visible defects on the surface. Non-destructive testing methods are used, for example, to measure the amount of other materials contained in a closed material, or to measure the thickness of the paint on metal surfaces, or to determine the condition of assembled parts, or to perform a series of investigations in radar systems.
Importance of Nondestructive Testing
The materials or parts produced may have a number of defects or defects depending on the way of production or the structural properties. Sometimes it is not possible to visually inspect them. For example, during production, corrosion cracks, fatigue cracks or heat treatment cracks may have occurred. These cracks, while reducing the strength of the material on the one hand, cause the surface to break and break in time. Such situations are more common especially in welded or non-welded steel and metal materials used in buildings, bridges and the automotive sector. Naturally, such a situation causes breakage and deterioration in the finished material, decreases quality and increases customer complaints.
Different methods are used in non-destructive testing. The first method is visual examinations only. Cracks or deteriorations are observed on the surfaces of the material produced and inwardly observed. However, this method is often inadequate. In these cases, other non-destructive testing methods are used. Here are a few of these methods:
- The liquid penetrant method is used to detect defects on the surfaces of all metals, glass, glazed glass and some plastics.
- The magnetic particle method is used only to detect defects occurring beneath the surface of materials with magnetic properties.
- The Eddy current method is used to detect defects occurring on all surfaces and sub-surfaces of all metals.
- The ultrasonic test and inspection method is used to detect internal defects of many materials.
- Radiographic method is used to detect surface or internal defects of certain materials of certain thickness.
Among these methods, the most commonly used method is the liquid penetrant method.
To understand the importance of non-destructive testing it is sufficient to look at why these methods are used:
- To identify and evaluate surface or inward errors
- To identify the causes of leakage
- Identify the wrong location as a point
- Measure the size of the wrong region
- To understand the structure and microstructure properties of materials
- To determine the mechanical and physical properties of the material
- To determine the tensile properties of the material
- To determine the type and chemical properties of the material
our organization TÜRCERT Technical Control and Certification Inc.provides non-destructive testing services with a competent manager and employee staff and a strong infrastructure.