If a backing bar is to be removed, how is this noted in the symbol?

If a backing bar is to be removed, how is this noted in the symbol?

• A. With an "R" In the tail of the welding symbol.
• B. With an "R" on the top surface of a weld symbol.
• C. With an "R" inside the weld symbol.
• D. With an "R" at the right side of the weld symbol.

Answer: (C)

The symbol uses the letter R to indicate that the backing bar is to be removed after welding. Placing R inside the weld symbol body communicates clearly that the backing material is temporary and must be removed once the weld is complete, rather than left in place. Put differently, this placement conveys a specific post-weld action directly tied to the weld itself.

The symbol uses the letter R to indicate that the backing bar is to be removed after welding. Placing R inside the weld symbol body communicates clearly that the backing material is temporary and must be removed once the weld is complete, rather than left in place. Put differently, this placement conveys a specific post-weld action directly tied to the weld itself.