GB/T 41115-2021Non-destructive testing of welds - Ultrasonic testing - Use of time-of-flight diffraction technique (TOFD) (English PDF)

1 Scope

This document specifies the semi-automatic or fully automatic Ultrasonic Time-of-Flight Diffraction (TOFD) technique for fusion welded joints of metallic materials with a thickness of not less than 6mm

Applications:

This document applies to simple geometry full-penetration welded joints of plates, tubes and vessels where both the weld metal and the base metal are low carbon steel or low alloy steel: Where appropriate, TOFD can also be used for other applications with lower ultrasonic attenuation (especially scattering attenuation)

Material:

This document provides that the material's longitudinal sound velocity is (5920 ± 50) m/s and the transverse wave sound velocity is (3255 ± 30) m/s:

Relevant regulations for the application of TOFD: When testing other materials with different sound speeds, it is necessary to consider the effect of sound speed:

This document, with reference to ISO 16828, provides the application of TOFD technology for the detection, positioning and dimensional measurement of discontinuities in fusion welded joints:

Use and guidance on the unique capabilities and limitations of this technology: TOFD can be used as a separate technology in manufacturing process inspection and in-service inspection:

It can also be used in combination with other non-destructive testing (NDT) methods or techniques:

This document establishes four test levels (A, B, C and D) as specified in ISO 17635: The higher the detection level, the more reliable the detection higher: This document also provides guidance on selecting the level of detection:

This document allows the evaluation of TOFD indications for subsequent acceptance: The evaluation is based on the transmitted wave, reflected wave and diffraction of the TOFD image

Evaluation of wave signals:

This document does not include discrete acceptance levels:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document:

ISO 5577 Non-destructive testing ultrasonic testing terminology (Non-destructive testing-Ultrasonic testing-Vocabula- ry)

ISO 9712 Non-destructive testing personnel qualification and certification (Non-destructive testing-Qualification and certification- tionofNDTpersonnel)

ISO 16828 Non-destructive testing, ultrasonic testing, ultrasonic diffraction sound, technical testing and evaluation methods (Non-destructive testing-

Ultrasonictesting-Time-of-flightdiffractiontechniqueasamethodfordetectionandsizingofdiscon- tinuities)

ISO 17640 Ultrasonic testing techniques, testing levels and evaluation for non-destructive testing of welds (Non-destructive testing of welds-Ultrasonictesting-Techniques,testinglevels,andassessment)

ISO 22232-1 Performance and inspection of ultrasonic testing equipment for nondestructive testing - Part 1: Instruments (Non-destructive testing-Characterizationandverificationofultrasonicexaminationequipment-Part 1:Instruments)

ISO 22232-2 Performance and inspection of ultrasonic testing equipment for nondestructive testing - Part 2: Probes (Non-destructive testing-Characterizationandverificationofultrasonicexaminationequipment-Part 2:Probes)

GB/T 40801 | GB/T 41110 | GB/T 41112 | GB/T 41107.2 | GB/T 41107.1 | […]