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This document specifies two ultrasonic acceptance levels known as acceptance level 2 (AL 2) and acceptance level 3 (AL 3) for full penetration welded joints in ferritic steels, in accordance with the quality levels of iso:proj:80209ISO 5817. These acceptance levels are applicable to testing carried out in accordance with ISO 17640. This document applies to the testing of fusion-welded joints in metallic materials with low sound attenuation (especially that due to scatter) with thicknesses from 8 mm to 100 mm. It is primarily intended for use on full penetration welded joints where both the welded and parent materials are ferritic. It can also be used for other types of welds, materials and thicknesses, provided the tests have been performed with necessary consideration of the geometry and acoustic properties of the component, and an adequate sensitivity can be employed to enable the acceptance levels of this document to be applied. The nominal frequency of probes used in this document is between 2 MHz and 5 MHz, unless attenuation or requirements for higher resolution call for other frequencies. It is important to consider the use of these acceptance levels in conjunction with frequencies outside this range carefully.