Is the leg length of a concave fillet weld the same as the weld size?

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Study for the CSA Welding Inspector Certification Test (W178.2) Level 1. Use flashcards and multiple choice questions with hints and explanations. Prepare for your certification!

Multiple Choice

Is the leg length of a concave fillet weld the same as the weld size?

Explanation:
The weld size for a fillet weld is related to the leg length, but a concave profile changes the cross‑section that actually carries load. In a concave fillet, the weld surface is recessed toward the root, reducing the throat—the minimum thickness that resists shear. The leg length (the dimension read as the size) is measured along the outer profile, while the throat thickness is smaller. Because the throat determines the strength and the throat is not equal to the leg length in a concave fillet, the leg length is not the same as the weld size in this case.

The weld size for a fillet weld is related to the leg length, but a concave profile changes the cross‑section that actually carries load. In a concave fillet, the weld surface is recessed toward the root, reducing the throat—the minimum thickness that resists shear. The leg length (the dimension read as the size) is measured along the outer profile, while the throat thickness is smaller. Because the throat determines the strength and the throat is not equal to the leg length in a concave fillet, the leg length is not the same as the weld size in this case.

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