标准编号：ISO 10863:2020
中文名称：焊接的无损检测 超声波检测 飞行时间衍射技术（TOFD）的使用
英文名称：Non-destructive testing of welds — Ultrasonic testing — Use of time-of-flight diffraction technique (TOFD)
发布日期：2020-05
标准范围
This document specifies the application of the time-of-flight diffraction (TOFD) technique to the
semi- or fully automated ultrasonic testing of fusion-welded joints in metallic materials of minimum
thickness 6 mm.
It applies to full penetration welded joints of simple geometry in plates, pipes, and vessels, where both the weld and the parent material are low-alloyed carbon steel. Where specified and appropriate, TOFD can also be used on other types of materials that exhibit low ultrasonic attenuation (especially that due to scatter).
Where material-dependent ultrasonic parameters are specified in this document, they are based on
steels having a sound velocity of (5 920 ± 50) m/s for longitudinal waves and (3 255 ± 30) m/s for
transverse waves. It is necessary to take this fact into account when testing materials with a different
velocity.
This document makes reference to ISO 16828 and provides guidance on the specific capabilities and
limitations of TOFD for the detection, location, sizing and characterization of discontinuities in fusion-welded joints. TOFD can be used as a stand-alone method or in combination with other non-destructive testing (NDT) methods or techniques, for manufacturing inspection, and for in-service inspection.
This document specifies four testing levels (A, B, C, D) in accordance with ISO 17635 and corresponding to an increasing level of testing reliability. Guidance on the selection of testing levels is provided.
This document permits assessment of TOFD indications for acceptance purposes. This assessment is
based on the evaluation of transmitted, reflected and diffracted ultrasonic signals within a generated
TOFD image.
This document does not include acceptance levels for discontinuities.
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