Standard No.:	GB/T 23902-2021
English Name:	Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique as a method for detection and sizing of discontinuities
Chinese Name:	无损检测 超声检测 超声衍射声时技术检测和评价方法
Chinese Classification:	J04    Basic standards and general methods
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2021-05-21
Implemented on:	2021-12-1
Status:	valid
Superseding:	GB/T 23902-2009 Non-destructive testing—Ultrasonic examination—Time-of-flight diffraction technique as a method for detection and sizing of discontinuities
Target Language:	English
File Format:	PDF
Word Count:	11000 words
Translation Price(USD):	400.0
Delivery:	via email in 1~3 business day

本文件规定了超声衍射声时技术（TOFD）方法的一般原则。本文件适用于低合金和碳素钢构件中不连续的检测。本文件也适用于其他类型材料，前提是使用超声衍射声时技术时要充分考虑构件的几何形状和材料声学特性及检测灵敏度。本文件一般情况下适用于ISO 16810所包含的材料内的不连续检测，包括焊缝可参考使用。选择此方法的原因在于其明确的超声探头位置和扫查方向。除非在引用文件中另有规定，本文件适用于最低要求。除非另有明确声明，本文件适用于ISO 16811规定的如下等级：--1类，没有限制；--2类和3类，适用指定的限制。