Volumetric inspection in this Guide is to be carried out by ultrasonic testing using the contact method with straight beam and/or angle beam technique. The testing procedures, apparatus and conditions of ultrasonic testing are to comply with the recognized national or international standards. Generally, the DGS (distance-gain size) procedure is to be applied using straight beam probes and/or angle beam probes with 1 to 4 MHz and an inspection should be carried out using a twin crystal 0° probe for near surface scans (25 mm) plus a 0° probe for the remaining volume. Fillet radii should be examined using 45°, 60° or 70° probes.
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