and welding operator performance tests by radiography of welds in test assemblies shall be judged unacceptable when the radiograph exhibits any imperfections in excess
of the limits specified below
(a) Linear Indications
(1) any type of crack or zone of incomplete fusion or penetration
(2) any elongated slag inclusion which has a length greater than
(-a) 1/8 in. (3 mm) for t up to 3/8 in. (10 mm),inclusive
(-b) 1/3t for t over 3/8 in. (10 mm) to 21/4 in.(57 mm), inclusive
(-c) 3/4 in. (19 mm) for t over 21/4 in. (57 mm)
(3) any group of slag inclusions in line that have an aggregate length greater than t in a length of 12t , except when the distance between the successive imperfections
exceeds 6L where L is the length of the longest imperfection in the group
(b) Rounded Indications
(1) The maximum permissible dimension for
rounded indications shall be 20% of t or 1/8 in. (3 mm),
whichever is smaller.
(2) For welds in material less than 1/8 in. (3 mm) in
thickness, the maximum number of acceptable rounded
indications shall not exceed 12 in a 6 in. (150 mm) length
of weld. A proportionately fewer number of rounded indications
shall be permitted in welds less than 6 in.
(150 mm) in length.
(3) For welds in material 1/8 in. (3 mm) or greater in
thickness, the charts in Figure QW-191.1.2.2(b)(4) represent
the maximum acceptable types of rounded indications
illustrated in typically clustered, assorted, and
randomly dispersed configurations. Rounded indications
less than 1/32 in. (0.8 mm) in maximum diameter shall
not be considered in the radiographic acceptance tests of
welders and welding operators in these ranges of material
thicknesses.