GB/T 23902-2021 Active National standards

GB/T 23902-2021 Non-destructive testing—Ultrasonic testing—Time-of-flight diffraction technique as a method for detection and sizing of discontinuities

Publish Date: 2021-05-21 Implement Date: 2021-12-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 23902-2021

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods

ICS Name: Non-destructive testing

Publish Date: 2021-05-21

Implement Date: 2021-12-01

Pages: 22 pages

Scope

This document sets forth the general principles of the time-of-flight diffraction (TOFD) ultrasonic testing method. This document is applicable to the detection of discontinuities in low-alloy and carbon steel components. This document is also applicable to other types of materials, provided that the geometric shape of the components, the acoustic properties of the materials, and the detection sensitivity are fully considered when using the TOFD ultrasonic testing method. This document is generally applicable to the detection of discontinuities in materials covered by ISO 16810, including welds, which can be used for reference. The reason for choosing this method is its clear ultrasonic probe position and scanning direction. Unless otherwise specified in the referenced documents, this document applies to the minimum requirements. Unless otherwise explicitly stated, this document applies to the following grades specified in ISO 16811: -- Class 1, no restrictions; -- Classes 2 and 3, applicable to specified restrictions.