TOFD

Pressure equipment ; Ultrasonic inspection ; TOFD technique ; Procedure requirements ; Acceptance criteria .

承压设备；超声检测；TOFD；程序要求；验收标准。

Ultrasonic time-of-flight diffraction ( TOFD ) technique is a new successful one for detecting and sizing the discontinuities in welded joints .

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。

The first part outlined the requirements for a TOFD written procedure and the TOFD system , the calibration items and the key points of an examination process .

第一部分概述TOFD工艺规程和设备系统要求，校准事项和检测工艺要领。

An ultrasonic TOFD ( time of flight diffraction ) B-scan image was processed in order to accurately locate crack tip in heavy aluminum butt weld .

为了精确定位开口裂纹的端部在铝合金厚板对接焊缝中的位置，对其超声衍射时差法（TOFD，timeoffflightdiffraction）的B扫描图像进行了处理。