What exactly is nondestructive testing (NDT)?

2023-11-21 09:35:16

What exactly is nondestructive testing? non-destructive Testing is non-destructive Testing, abbreviated NDT (or NDE, non-destructive examination) is also called non-destructive testing, simply defined as a variety of tests on the object without damage. Nondestructive Nondestructive testing (NDT) is any method of determining the strength and integrity of an object without destroying it. Other labels (e.g., Nondestructive inspection (NDI), nondestructive evaluation (NDE), and nondestructive inspection (NDE)) can be used interchangeably. Different labels are more commonly used in different geographical areas or by different manufacturers. Another understanding is that under the premise of not damaging or affecting the performance of the tested object, the principle technology of X-ray, ultrasonic, infrared, electromagnetic and other technologies combined with instruments are used to detect defects, chemical and physical parameters of materials, parts and equipment. Common such as ultrasonic detection of cracks in welds. The Society of Nondestructive Testing of the Chinese Society of Mechanical Engineering is the academic organization of nondestructive testing in China, and TC56 is its standardization body.

Regardless of which label is used, NDT NDT describes the category of inspection rather than a specific test method. Some of the most common types of nondestructive testing include ultrasonic testing, eddy current testing, penetrant testing, magnetic particle testing, radiography, laser testing, and visual testing.

Each label refers to the means of testing, for example, ultrasonic testing uses high-frequency sound waves. There are several other types of nondestructive testing that will be examined later in this overview. With the exception of visual testing (a broad term used to describe all ways of examining using the main senses: sight, hearing, touch, and smell), each test method requires specialized equipment that is specifically designed. Understanding the pros and cons of each approach helps companies meet their testing needs in the most efficient way. Technology has made the modern world. Non-destructive testing makes it safe to use.

NDT is an essential and effective tool for industrial development, which reflects the level of industrial development of a country to a certain extent, and its importance has been recognized. In November 1978, China established a national nondestructive testing academic organization - the Nondestructive Testing Branch of the Chinese Society of Mechanical Engineering. In addition, metallurgy, electric power, petrochemical, shipping, aerospace, nuclear energy and other industries have also set up their own non-destructive testing societies or associations; Some provinces, autonomous regions, special administrative regions, municipalities directly under the central government and prefecture-level cities have established provincial (city) level and prefecture-level nondestructive testing societies or associations; Northeast, East China, Southwest and other regions have also set up regional non-destructive testing societies or associations. There is still a big gap between China and the world's advanced countries in the basic theoretical research and instrument and equipment development of non-destructive testing, especially in infrared, acoustic emission and other high-tech testing equipment.

Commonly used non-destructive testing methods: eddy current testing (ECT), radiographic testing (RT), ultrasonic testing (UT), magnetic particle testing (MT) and liquid penetration testing (PT) five kinds. Other non-destructive testing methods: acoustic emission detection (AE), thermal image/infrared (TIR), leakage test (LT), AC field measurement technology (ACFMT), magnetic leakage test (MFL) far field testing method (RFT), ultrasonic diffraction time difference method (TOFD), etc.