A non-destructive testing method for small-diameter pipes based on phased array ultrasonic flaw detector

Abstract

The invention provides a small-diameter tube nondestructive testing method based on a phased array ultrasonic flaw detector. The small-diameter tube nondestructive testing method comprises the following steps: carrying out CIVA and sound field simulation on a detected workpiece; debugging the phased array ultrasonic flaw detector by a simulation test block and verifying on a simulated workpiece; grinding two sides of a welding seam of the detected workpiece, detecting the detected workpiece ground smoothly by the debugged phased array ultrasonic flaw detector; and analyzing the detection graph to obtain a detection result. The method can perform CIVA and sound field simulation on the detected workpiece before field detection, and adopts an appropriate comparison test block and the simulation workpiece for debugging the phased array ultrasonic flaw detector; the method adopts different scanning modes according to the different thicknesses of the simulation workpieces in a debugging process, can improve the debugging precision, can improve the field detection sensitivity, can prevent repeated detection, saves the detection time and reduces the detection cost.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to a nondestructive testing method for small-diameter pipes based on a phased array ultrasonic flaw detector. Background technique [0002] At present, in domestic electric power (nuclear power, thermal power) installation projects, small-diameter pipes are densely distributed. During the installation process, in a three-dimensional three-dimensional space, there are many cross-operation points and wide areas. Usually, 100% ray or conventional welding is required for pipe welds. Ultrasonic non-destructive testing to ensure installation quality. However, the use of ray detection or conventional ultrasonic detection has limitations. First, the use of ray detection will cause damage to the human body due to the radiation. The two sides of the small-diameter tube almost become blind spots for radiation detection. Although the use of large-dose gamma source detection will...

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Problems solved by technology

However, the use of ray detection or conventional ultrasonic detection has limitations. First, the use of ray detection will cause damage to the human body due to the radiation. The two sides of the small-diameter tube almost become blind spots for radiation detection. Although the use of large-dose gamma source detection will have certain effects, it is not worth the gain compared with the pollution of the radiation source to the surrounding environment and the damage to the detection personnel. Moreover, When performing radiographic inspection, it is necessary to clear the installation personnel at multiple operating points in the installation space, which takes up installation time and affects the progress of the installation and construction project; secondly, conventional ultrasonic inspection is used. Although it is sensitive to area defects, its detection The ability of volume defects is poor, and the defect display is not intuitive, the detection method is single, the sensitivity is low, and the detection results are greatly affected by human

It can be seen from the above that due to the shortcomings of ray detection and conventional ultrasonic detection technology, it often brings a lot of inconvenience during the construction process.

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