In a fillet weld, the leg and throat refer to:

• A. The leg is vertical height of weld; the throat is the width
• B. Leg is length of weld along joint; throat is distance from toe to face
• C. Leg and throat are synonymous
• D. The leg is distance along the face from the joint to the toe; the throat is the shortest distance from root to face

Answer: (D)

In a fillet weld, the leg length is the distance along each member from the weld root up to the toe, i.e., along the face of the joint. The throat is the shortest distance from the weld root to the weld face, which is the perpendicular distance in the cross-section diagram (the altitude to the hypotenuse of the weld’s triangular cross-section). So describing the leg as the distance along the face from the joint to the toe and the throat as the shortest distance from root to face matches how fillet weld geometry is defined. The other options mix up these definitions or treat them as the same thing, which they are not.