AWS Certified Welding Inspector — FundamentalsWelding SymbolsHard
A CWI is reviewing a blueprint for a complex aerospace component that requires a specific nondestructive examination. The NDE symbol indicates 'PT' on the reference line, with a 'B' placed above it. What does the 'B' signify in this context?
- AThe NDE is to be performed before welding.
- BThe NDE is to be performed on the bevel side.
- CThe NDE is to be performed on both sides of the joint.
- DThe NDE is to be performed after welding.
Show answer & explanationAnswer & explanation
Correct answer: A. The NDE is to be performed before welding.
In NDE symbols, letters placed above the NDE symbol on the reference line indicate the sequence of examination. 'B' stands for 'Before welding', specifying that the penetrant testing (PT) must occur prior to the welding operation.
Why the other options are wrong
- B. Bevel side is a joint preparation, not an NDE timing indicator.
- C. Examination on both sides is indicated by symbols on both sides of the reference line or a specific note.
- D. Examination after welding is the default unless 'B' (before) is specified.
NDE Sequence Symbol
Letters placed above NDE symbols on the reference line specify the sequence of examination relative to the welding operation.
- 'B' = Before welding.
- 'A' = After welding (default, often omitted).
- 'I' = During welding (interpass).
Memory trick: NDE letters tell you when, like a schedule.