There are different non-destructive testing methods, Such as visual inspection, magnetic particle test, liquid penetrant test, radiographic inspection, ultrasonic inspection, electromagnetic induction test, phased array method inspection and eddy current test. In addition to these conventional methods, there are also improved non-destructive testing methods applied to the product.
for more information, please flowing link:
http://rag.ir/file/Attachments/hlh4oflt.pdf