Where should the leg length of a fillet weld be measured?

Where should the leg length of a fillet weld be measured?

• A. At the root of the weld.
• B. At the toe of the weld.
• C. At the midpoint of the weld bead.
• D. Along the filler metal.

Answer: (B)

The leg length of a fillet weld is defined by the distance from the weld root to the weld toe along each leg, and that measurement is taken at the toe. The toe is where the weld meets the base metal surface, and it is the outer edge that determines how far the weld extends along each member. Measuring at the root wouldn’t reflect the visible size of the weld on the joint, and the midpoint or the filler metal doesn’t define the leg length. So, the appropriate place to measure is at the toe of the weld.

The leg length of a fillet weld is defined by the distance from the weld root to the weld toe along each leg, and that measurement is taken at the toe. The toe is where the weld meets the base metal surface, and it is the outer edge that determines how far the weld extends along each member. Measuring at the root wouldn’t reflect the visible size of the weld on the joint, and the midpoint or the filler metal doesn’t define the leg length. So, the appropriate place to measure is at the toe of the weld.