How is a field weld indicated on a welding symbol?

• A. By a field weld flag or note on the symbol indicating the weld must be performed at the site.
• B. By welding with extra filler metal.
• C. By a color change in the weld bead.
• D. By a special sawtooth pattern on the joint.

Answer: (A)

Welding symbols use a field weld indicator to show that a weld must be made on the job site. This is shown with a field weld flag on the symbol or with a note such as “FIELD WELD,” clearly signaling to the welder that the weld is to be performed at the location rather than in the shop. The flag on the reference line tells you where the field weld is required, and the accompanying note communicates that it must be done in the field.

Extra filler metal, a color change in the weld bead, or a sawtooth pattern are not standard ways to indicate field welding in the symbol system; they either pertain to material specification, appearance, or joint detailing, not the site of the weld.