What dimension is used to determine the size of a fillet weld?

What dimension is used to determine the size of a fillet weld?

• A. Throat
• B. Leg length
• C. Length of the shortest leg
• D. Weld length along the joint

Answer: (C)

Fillet weld size is defined by the leg length—the distance along each weld face from the joint to the toe. When the two legs aren’t equal, the weld size is governed by the shorter leg because you can’t have a weld larger than the smallest leg on either side. The throat is a separate measure used for strength calculations, not for sizing the weld. The weld length along the joint describes how long the weld runs, not how thick the cross-section is. So, the dimension that determines the size is the length of the shortest leg.

Fillet weld size is defined by the leg length—the distance along each weld face from the joint to the toe. When the two legs aren’t equal, the weld size is governed by the shorter leg because you can’t have a weld larger than the smallest leg on either side. The throat is a separate measure used for strength calculations, not for sizing the weld. The weld length along the joint describes how long the weld runs, not how thick the cross-section is. So, the dimension that determines the size is the length of the shortest leg.