Phased array ultrasonic detection system and method for conventional island shaft forgings of nuclear power station

Abstract

The invention discloses a phased array ultrasonic detection system and a phased array ultrasonic detection method for conventional island shaft forgings of a nuclear power station. The system comprises a phased array ultrasonic detection probe, at least one shaft verification test block and four different wedge blocks, the verification test block is used for carrying out power verification on thedetection probe before detection; the first wedge block is used for being matched with the probe to carry out surface longitudinal / internal longitudinal defect detection on the shaft forge piece in afull-focusing / fan-shaped scanning imaging mode; the second wedge block is used for being matched with the probe to carry out surface transverse / internal transverse defect detection on the shaft forgepiece in a full-focusing / fan-shaped scanning imaging mode; the third wedge block is used for being matched with the probe to carry out internal longitudinal defect detection on the shaft forge piece in a third scanning angle range in a fan-shaped scanning imaging mode; and the fourth wedge block is used for being matched with the probe to carry out internal transverse defect detection on the shaftforge piece in a fourth scanning angle range in a fan-shaped scanning imaging mode. Permeation detection does not need to be implemented, the number of ultrasonic probes and detection blind areas arereduced, and detection data are stored.

Description

technical field [0001] The invention relates to the field of defect detection of nuclear power plant forgings, in particular to a phased array ultrasonic detection system and detection method for conventional island shaft forgings of nuclear power plants. Background technique [0002] The existing defect detection scheme of nuclear power plant forgings generally adopts the detection scheme of conventional ultrasonic plus penetration. Penetration is used to detect open defects on the surface of shaft forgings. Conventional ultrasound is used to detect internal defects in shaft forgings. During the penetrant test, the penetrant is brushed on the surface of the shaft forging, and after a certain period of penetration, the penetrant is cleaned with a cleaning agent, and finally the image is developed with a developer. Conventional ultrasonic detection methods are based on ultrasonic pulse reflection manual detection, and the detection is carried out with straight probes and sh...

AI Technical Summary

Problems solved by technology

[0004] 1) The detection speed is slow, and a combination of multiple conventional ultrasonic probes is required to complete the ultrasonic detection work, and two detection methods, ultrasonic and penetration, are required;

[0005] 2) The refraction angle of the probe is single, the coverage of the sound beam of the probe is limited, the detection blind area is large, and the defect detection rate is low;

[0006] 3) In order to ensure the coverage of the detection area during the detection of the shear wave oblique probe, the distance of the probe movement is relatively large, but the on-site detection may not be able to implement 100% detection of the inspected area due to limited space, which increases the possibility of detection blind spots;

[0007] 4) The test results cannot be saved for further analysis;

[0008] 5) The detection sensitivity is low, and small defects are prone to missed detection

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