Butt Welds:
Geometrical Properties
The size of a butt weld is described by
(a) The throat thickness; or
(b) The thickness of the thinner part (for complete penetration along with sealing run).
(c) 5/8 × thickness of thinner part (for incomplete penetration, i.e. no sealing run).
(* The reinforcement portion is not involved as throat thickness.)
Figure