AWS Certified Welding Inspector — FundamentalsWelding SymbolsMedium
A CWI is inspecting a blueprint for a pressure vessel assembly. The welding symbol for a critical butt joint includes a supplementary symbol that is a circle intersecting the junction of the reference line and the arrow. What does this supplementary symbol signify?
- AWeld all around.
- BBacking bar required.
- CField weld.
- DMelt-through.
Show answer & explanationAnswer & explanation
Correct answer: C. Field weld.
The circle intersecting the junction of the reference line and the arrow is the standard supplementary symbol for a field weld. This means the weld is to be made at the site of final construction, not in the shop.
Why the other options are wrong
- A. A circle at the junction of the reference line and arrow indicates a field weld, not weld all around.
- B. Backing bars are indicated by a rectangle or specific joint preparation.
- D. Melt-through has a different, specific symbol.
Field Weld Symbol
A supplementary symbol, a circle at the junction of the reference line and the arrow, indicating that a weld is to be made at the place of final erection or assembly, not in the shop.
- Circle at arrow/reference line junction.
- Indicates on-site welding.
- Distinguishes from shop welds.
Memory trick: Supplementary symbols add extra instructions, like a field trip.