When is it not necessary for flare bevel groove welds in T-joints to be flush with the tangent of the curve perpendicular to the horizontal planar?

• A. When radii measured is greater than 10mm
• B. When radii measured is less than 10mm
• C. When radii measured is equal to 10mm
• D. When radii measured is between 5 and 15 mm

Answer: (A)

When the flare bevel groove in a T-joint has a relatively large bend, the curvature is gentle enough that the weld bead can blend across the toe without needing to sit exactly flush with the tangent to the curve perpendicular to the horizontal plane. A radius greater than about 10 mm means the surface changes slowly, so small deviations from perfect flush alignment don’t significantly affect fit-up or weld quality. In contrast, with smaller radii the curve is steeper, and not being flush with the tangent can create gaps or sharp transitions that hinder proper fusion and produce a poorer contour. So the not-necessary condition applies when the measured radius is greater than 10 mm.