Final answer:
In welding, the leg length of a concave fillet weld is the same as the weld size, referring to the distance from the root to the toe along the side of the weld's triangular cross-section.
Step-by-step explanation:
The question "Is the leg length of a concave fillet weld the same as the weld size?" deals with the terminology used in welding, specifically in terms of a fillet weld. In the context of fillet welds, the leg length is typically considered to be the distance from the root of the weld to the toe of the weld along one side of the triangular cross-section of the weld. The weld size for a fillet weld is usually defined by the length of the legs of the right triangle that the weld forms. Thus, the leg length and the weld size in a fillet weld essentially refer to the same measurement, and as such, the answer to the question is: a. Yes, the leg length of a concave fillet weld is the same as the weld size.