What are the common non-destructive testing methods?

In the process of product production, products need to go through production, testing and other links. In the process of testing, non-destructive testing is the most modern testing method used. Non-destructive testing is the use of sound or light and other media characteristics to scientifically detect whether there are defects in products and other issues. The advantage of this method is that it does not damage the tested product and can give specific information about the defect, such as size, location, nature, and quantity. Practitioners of non-destructive testing must receive professional training and obtain qualifications. Different countries or regions have different requirements for non-destructive testing, which requires practitioners to be familiar with specific conditions.

Non-destructive testing has become an indispensable testing method for modern industrial development, and it can reflect the level of industrial development to a certain extent. In terms of the basic theoretical research of non-destructive testing, our country still needs to continue to learn, especially in infrared and other high-tech testing equipment.

The common non-destructive testing methods are as follows, among which the most common ultrasonic testing, there are many types of ultrasonic detectors. It is proved by theory that in the reflection theorem, ultrasonic waves will be reflected on two different media. In this way, the specific internal conditions of the product can be detected. Simply put, in a uniform material, once a defect occurs, it will cause discontinuity of the material. Ultrasonic waves can detect special conditions through characteristics. In addition, there are detection methods such as radiation, magnetic powder, and penetration. Thermal imaging infrared and leakage technologies are not as common as the above, but they are also non-destructive testing technologies.

The pulse reflection ultrasonic nondestructive tester invented at present, when there is a defect in the product, a different medium is formed between the defect and the steel material, and the operator emits an ultrasonic wave. After it encounters the interface of the different medium, it will reflect. After such a reflection process, the energy can be received by the probe, and a waveform of the ultrasonic reflected wave can be displayed on the display screen that receives the data. Generally speaking, the display position of the abscissa is the depth of the defect in the inspected product. Different heights and shapes are produced in the reflected waves, mainly due to different defects.