ISO 11666:2018 PDF

Scope: 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, which correspond to level D is not included in this document, as ultrasonic testing is generally not requested for this weld quality. These acceptance levels are applicable to testing carried out in accordance with ISO 17640. This document applies to the testing of full penetration ferritic steel welds, with thicknesses from 8 mm to 100 mm. 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.

ISO 11666:2018 Referenced Document

ISO 17635:2016 Non-destructive testing of welds - General rules for metallic materials
ISO 17640:2017 Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment
ISO 23279:2017 Non-destructive testing of welds — Ultrasonic testing — Characterization of discontinuities in welds
ISO 5577:2017 Non-destructive testing - Ultrasonic testing - Vocabulary
ISO 5817:2014 Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections

2018 ISO 11666:2018 Non-destructive testing of welds - Ultrasonic testing - Acceptance levels
2010 ISO 11666:2010 Non-destructive testing of welds - Ultrasonic testing - Acceptance levels