BS EN ISO 11666 PDF

Non-destructive testing of welds — Ultrasonic testing — Acceptance levels This standard has been revised by ISO Abstract ISO specifies ultrasonic acceptance levels 2 and 3 for full penetration welded joints in ferritic steels, which correspond to ISO quality levels B and C. An acceptance level corresponding to ISO quality level D is not included in ISO as ultrasonic testing is generally not requested for this weld quality. These acceptance levels are applicable to testing carried out in accordance with ISO ISO applies to the examination of full penetration ferritic steel welds, with thicknesses from 8 mm to mm. It can also be used for other types of welds, materials and thicknesses above mm, provided the examinations 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 ISO to be applied. The nominal frequency of probes used in ISO is between 2 MHz and 5 MHz unless attenuation or requirements for higher resolution call for other frequencies.

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