Welded joints of pressure vessels are tested and inspected by mechanical testing and nondestructive testing as the standards or codes.
Mechanical test is performed with a piece of specimen for only typical testing, while nondestructive test is only for detecting of inner discontinuity of welded joint.
Quality of pressure vessels is required inspection system to form quality of welded joints in the background of such tests. This paper has been examined inspection systems of various countreis and is conesidering consolidately the qaulity of the weleded joints on the system and standard in the aspects of test and inspection.