The difference between welded parts and test pieces in JB4708-2000
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After reviewing the terms in JB4708-2000, a 3.5 welded component refers to a pressure vessel or its components that are connected by welding; such components include both the base material and the welded joints. 3.6 Test pieces: Weldments prepared according to a predetermined welding procedure for use in welding procedure qualification tests. The test specimen consists of two parts: the base metal and the welded joint. It can be understood as: Is the test piece used to evaluate the welded joint?
It cannot be understood in this way. When the welded piece is used as a piece for testing, it becomes a test specimen. There are specified dimensions for test specimens, but no such specifications exist for welded pieces.