In a fillet weld symbol, what determines the weld size?

• A. The size is determined by the weld length
• B. The size is determined by welding current
• C. The size is determined by welding speed
• D. The size is determined by the leg lengths specified

Answer: (D)

In fillet weld symbols, the size is defined by the leg lengths specified. The number you see in the size position represents how long each leg of the fillet is, and that leg length determines the cross-sectional size and the weld’s strength within the weld symbol. The weld length along the joint is a separate dimension and does not set the weld size. Welding current or welding speed influence heat input and deposition but do not determine the cross-sectional size shown in the symbol. The throat of the fillet is derived from the leg length, and is typically smaller than the leg length itself.