1.1 ,This specification2 covers an ultrasonic angle-beam procedure and acceptance standards for the detection of internal discontinuities not laminar in nature and of surface imperfections in a steel plate. This specification is intended for use only as a supplement to specifications which provide straight-beam ultrasonic examination.
Note 1: ,An internal discontinuity that is laminar in nature is one whose principal plane is parallel to the principal plane of the plate.