Surface Delta and
Radius
When you add a weld bead with a Surface
Shape of Convex or Concave, you must specify the Top Surface Delta. For a backing run
weld, you also specify the Bottom Surface
Delta. If the Surface Shape
is Flat, there is no surface delta.
For a convex weld, the top surface delta is the distance between the
highest point on the bead and the contact faces.

For a concave weld, the distance is measured below
the top surface rather than above.

For a fillet weld, you also specify the Radius.
The radius is measured as the radius of an imaginary ball rolling along
the seam. The edges of the weld bead are at the points of tangency, where
the ball meets the contact faces.
In the illustrated fillet weld, the specified Radius
is 10mm, and the Top Surface Delta
is 2mm.