3.18.3 Minimum and Maximum Fillet Size
It is advisable to point out that some governing design applications like CSA W59 (Welded Steel
Construction) or AWS D1.1 (Structural Welding Code) stipulate minimum fillet sizes as a function of
material thickness.
On the other hand, maximum fillet sizes may be set either by considerations of balanced design, that
is, by keeping the capacity of the welds reasonably close to that of the parent metal, or by
requirements of good welding practice.
With regard to the latter, specific reference is made to welding against a cut edge where the maximum
recommended fillet size for thicknesses over ¼ inch (6mm) is: