Which one of the certificates for large-scale mechanical work should a person engaged in ultrasonic work take?

Does ultrasonic work refer to ultrasonic flaw detection (UT)?

If yes, you can obtain the professional certificate of nondestructive testing association (there are three grades I, II and III, the former is less difficult and the latter is more difficult), which is recognized in China; You can also obtain ASME certificate (the scoring method is the same as that of NDT Association), which is mainly used for some foreign-related projects (European countries).