Commonly used nondestructive testing methods
Commonly used non-destructive testing methods include ray testing (RT), ultrasonic testing (UT), magnetic particle testing (MT) and penetration testing (PT), which are called four conventional testing methods. These four methods are the most commonly used nondestructive testing methods for manufacturing quality testing and in-use testing of special pressure equipment.
Among them, RT and UT are mainly used to detect internal defects of test pieces, and MT and PT are mainly used to detect surface defects of test pieces. Other non-destructive testing methods for pressure-bearing special equipment include eddy current testing (ET) and acoustic emission testing (AE).
There are many types of rays, among which X-rays, Y-rays, and neutron rays are easy to penetrate. All three types of radiation are used for non-destructive testing. Among them, X-rays and Y-rays are often used to detect defects in welds of pressure-bearing equipment and other industrial products and structural materials, while neutron radiation is only used for special occasions. Radio-graphic testing is an important professional category of industrial non-destructive testing. The main application is to detect macroscopic geometric defects (flaw detection) inside the test piece.