How is fillet weld size specified on a symbol?

• A. By the throat dimension
• B. By the leg length
• C. By the weld length along the joint
• D. By the weld weight

Answer: (B)

Fillet weld size on a symbol is defined by the leg length. In the fillet weld symbol, the numeric value placed next to the symbol represents the length of each leg of the weld’s triangular cross-section, which directly sets the weld’s cross-sectional size. The throat dimension is a derived measure—roughly 0.707 times the leg length for a standard 45-degree fillet—and is used for strength calculations rather than to specify size on the symbol. The weld length along the joint is a separate dimension shown elsewhere on the symbol, not the size. So the leg length is the correct dimension used to specify fillet weld size.