Ultrasonically smooth or rough, thr

Ultrasonically smooth or rough, through-wall (TW) oriented planar defects, aligned parallel with the welding direction (i.e. longitudinal defects) which can be embedded or surface-breaking and located anywhere on the weld fusion faces, in the weld body or in the HAZ within the inspection volume. The defects have a through-wall extent (TWE) of ≥ 8 mm and a length of ≥ 48 mm, skew of 0° ± 5° with respect to the welding direction and tilt of 0° ± 5° or tilt of +15° -5° or -15° +5° in the inner 15 mm of the thickness up from the counterbore surface with respect to the weld centre line. Defect gape (between faces) is ≥ 50 μm.