In welding drawings, how is a fillet weld typically represented, and what does the leg length indicate?

In welding drawings, how is a fillet weld typically represented, and what does the leg length indicate?

• A. A triangular fillet symbol on the reference line.
• B. The leg length indicates the length of the weld along the joint.
• C. A triangular fillet symbol on the reference line; the leg length indicates the weld size (leg dimension) to be applied.
• D. A circle symbol indicating the type of weld.

Answer: (C)

When you look at welding drawings, a fillet weld is shown with a triangular symbol placed on the reference line. That triangle marks the joint where a fillet weld is required. The leg length of the symbol is what defines the weld size—the actual leg dimensions of the cross‑section that sits on each member. In other words, the leg length tells you how big the fillet weld is, not how long the weld runs along the joint (that length is a separate dimension if specified). The throat of the fillet, roughly 0.707 times the leg length, relates to the weld’s effective strength, but the size you read directly from the symbol is the leg length.

When you look at welding drawings, a fillet weld is shown with a triangular symbol placed on the reference line. That triangle marks the joint where a fillet weld is required. The leg length of the symbol is what defines the weld size—the actual leg dimensions of the cross‑section that sits on each member. In other words, the leg length tells you how big the fillet weld is, not how long the weld runs along the joint (that length is a separate dimension if specified). The throat of the fillet, roughly 0.707 times the leg length, relates to the weld’s effective strength, but the size you read directly from the symbol is the leg length.