Wilco,
Based on this interpretation it appears it is depth,
Regards,
Shane
Subject. Welder Qualification (Allowable Undercut)
Code Edition: Dl.1-86
Code Provision: Subsection 5.28.6
AWS Log: Dl-88-001
Inquiry: In 5.28.6, directions are provided for visually evaluating a welder qualification test plate in accordance
with 9.25.1. There are two maximum limits of allowable undercut in 9.25.1; which of these
values should be used for evaluation of the welder qualification test plate?
Response:
Undercut shall be no more than 1/32 in. (0.8 mm) deep. Note that the maximum allowable undercut
for qualifying procedures, welders, welding operators, and tack welders was revised to 1/32 in.
maximum in AWS Dl.1-88.