1996 Edition, paragraph 936.6.1 (c) “The total joint penetration shall not be less than the thickness of the thinner of the components being joined, except that incomplete root penetration is acceptable if it does not exceed the lesser of 1/32 in. or 20% of the required thickness, and its extent is not more than 1½ in. in any 6 in. of weld.”
Paragraph 936.6.1 (d) “Undercut shall not exceed the lesser of 1/32 in. or 12½% of wall thickness. Thickness of weld reinforcement shall not exceed 3/16 in.”
Mankenberg