多通道TOFD自动超声检测设备

超声衍射时差法（Time of flight diffraction,TOFD）是近几年开始推广应用的检测技术,具有对各向裂纹检出率高、检测快的优点,国内已经用于锅炉检测等行业,还未应用于长输管道热煨弯管检测领域。针对热煨弯管需要全部超声检查的工程需求,通过对多通道TOFD检测技术的研究,解决了多通道TOFD硬件检测系统研制和分层TOFD检测数学模型的设计等关键技术难题,研发出以分层TOFD检测技术为基础的热煨弯管裂纹自动超声检测设备,实现对厚壁热煨弯管管材质量的二维全自动超声检测,满足对弯管质量检测速度快、检出率高等技术需求。

Multichannel TOFD Automatic Ultrasonic Testing Equipment

Time of flight diffraction（TOFD） has begun to be popularized as a detecting technology in recent years. Its excellence includes a high detecting rate and velocity for omni-directional cracks. It has been applied to domestic boiler detecting etc,but it has not been applied in the hot bend elbow detecting domain on long-distance pipelines. According to the requirement that all the ends of hot bend elbows should be detected by ultrasound,the key technological problems with the multi-channel hardware detecting system development and the lamination of a TOFD detecting mathematical model designed have been solved by researching the multi-channel TOFD detecting technology. A hot bend elbow automatic ultrasonic detecting device has been developed on the basis on the lamination of TOFD detecting technology. The paper has achieved application of 2D automatic ultrasonic detection to the checking of the quality of pipe materials use in the thick wall hot bend elbow by TOFD detecting technology. It can also satisfy such technical requirements as a high velocity and rate in detecting the ends of hot bend elbows.