This document specifies the application of phased array technology for the semi- or fully automated ultrasonic testing of fusionwelded joints in steel parts with thickness values between 3,2 mm and 8,0 mm. This meets the typical range of tube wall thickness values in boilers, which is an important application of this testing technology. The minimum and maximum value of the wall thickness range may be exceeded, when testing level D of this standard is applied. This Standard applies to full penetration welded joints of simple geometry in plates, tubes, pipes, and vessels, where both the weld and parent material are lowalloy and/or fine grained steel. NOTE Semi-automated testing encompasses a controlled movement of one or more probes on the surface of a component along a fixture (guidance strip, ruler, etc.), whereby the probe position is unambiguously measured with a position sensor. The probe is moved manually. Fully automated testing includes mechanized propulsion in addition. Where material-dependent ultrasonic parameters are specified in this International Standard, they are based on steels having a sound velocity of 5920 (± 50) m/s for longitudinal waves, and 3255 (± 30) m/s for transverse waves. It is necessary to take this fact into account when testing materials with a different velocity. This document provides guidance on the specific capabilities and limitations of phased array technology for the detection, location, sizing and characterization of discontinuities in fusion-welded joints. Ultrasonic phased array technology can be used as a standalone technique or in combination with other non-destructive testing (NDT) methods or techniques, during manufacturing and the testing of new welds / repair welds (preservice testing). This document specifies two testing levels: level C for standard situations; level D for different situations/ special applications. This document describes assessment of discontinuities for acceptance purposes based on: height and length; amplitude (equivalent reflector size) and length; go / no go decision. This International Standard does not include acceptance levels for discontinuities.