Nondestructive testing:

· X-ray detection: gamma rays and x-rays

· ultrasonic inspection: conventional UT, TOFD, PAUT and ultrasonic thickness measurement

· magnetic powder detection: routine MT and fluorescence MT

· penetration detection: conventional PT and fluorescent PT

· eddy current testing: ET testing

Features:

1. Non-destructive

Non-destructive -- means not to lose parts except to eliminate nonconforming products while obtaining test results. Therefore, the size of inspection is not limited by the number of parts, both sampling inspection, and when necessary, the use of general inspection. Therefore, it has more flexibility (universal inspection, random inspection) and reliability.

2. Mutual accommodation

Mutual compatibility -- that is, the mutual compatibility of inspection methods, that is, different inspection methods can be adopted for the same part at the same time or in sequence; And the same test can be repeated. This is also a non-destructive benefit.

3. Dynamic

Dynamic. This means that nondestructive testing can examine parts in use and examine the cumulative impact of a product's run time in due course. Therefore, the failure mechanism of the structure can be found out.

4. Rigor

Strictness - refers to the strictness of nondestructive testing techniques. First, nondestructive testing needs special instruments and equipment. Specially trained inspectors are also required to operate according to strict procedures and standards.

5. Divergence of test results

Test result divergence - different testers may have different results for the same specimen. Especially in ultrasonic inspection, the same inspection project should be completed by two inspectors. A "consultation" is required.

To sum up, the characteristics of nondestructive testing are nondestructive, reciprocal, dynamic, strict and inconsistent.