射线检测(RT)的检测厚度受设备能力限制，对缺欠检出率有方向性限制。就焊缝缺欠测高方法而言，衍射时差法超声检测(TOFD)是当前超声波检测领域的前沿技术之一，较传统的方法测试精确得多。
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概述了超声波衍射时差法(TOFD)，对目前世界上主要的七个TOFD检测标准或规范进行了分析和比较，归纳了其中十二个方面的异同点。
Time of flight diffraction (TOFD) was summarized as a new nondestructive testing method. The present seven main TOFD standards in the world were evaluated and compared in twelve different portions.
超声衍射时差(tofd)法是焊缝超声检测和缺陷定量很有发展前景的新技术。
Ultrasonic time-of-flight diffraction (TOFD) technique is a new successful one for detecting and sizing the discontinuities in welded joints.
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