Final answer:
The term for the distance from the root of the joint to the toe of a fillet weld is the 'leg length.' It's essential for determining the weld size and ensuring joint strength.
Step-by-step explanation:
The distance from the root of the joint to the toe of a fillet weld is called the leg length. This is a critical measurement in welding because it relates to the size of the weld, which determines the strength and quality of the joint.
The leg length must be appropriately selected based on the thickness of the materials being joined and the requirements of the weld. It's important that the leg length meets the specifications to ensure structural integrity.