What radius threshold defines a T-joint edge that can be considered a flare bevel fillet weld?

What radius threshold defines a T-joint edge that can be considered a flare bevel fillet weld?

• A. 10 mm
• B. 5 mm
• C. 15 mm
• D. 20 mm

Answer: (A)

In this weld geometry, a flare bevel fillet weld is used when the T-joint edge has a sufficiently rounded root so that a fillet weld on both sides can achieve the required throat and fusion without a separate groove bevel. The defining threshold for that edge shape is a root radius of 10 mm—the smallest radius that qualifies as a flare bevel for this context. If the edge radius is 10 mm or larger, it’s treated as flare bevel fillet weldable; if it’s smaller, the edge isn’t considered flare bevel and would typically require additional beveling or a different groove weld approach. The other radii you see (5 mm, 15 mm, 20 mm) all relate to the same concept, but 10 mm is the value that sets the minimum threshold.

In this weld geometry, a flare bevel fillet weld is used when the T-joint edge has a sufficiently rounded root so that a fillet weld on both sides can achieve the required throat and fusion without a separate groove bevel. The defining threshold for that edge shape is a root radius of 10 mm—the smallest radius that qualifies as a flare bevel for this context. If the edge radius is 10 mm or larger, it’s treated as flare bevel fillet weldable; if it’s smaller, the edge isn’t considered flare bevel and would typically require additional beveling or a different groove weld approach. The other radii you see (5 mm, 15 mm, 20 mm) all relate to the same concept, but 10 mm is the value that sets the minimum threshold.