Water spray type automatic scanning device for ultrasonic TOFD nondestructive testing

Abstract

The invention relates to a water spray type automatic scanning device for ultrasonic TOFD nondestructive testing. The water spray type automatic scanning device for ultrasonic TOFD nondestructive testing consists of a probe clamping portion, a coupling water circulating portion, a probe spacing PCS adjustment portion and a three-dimensional movement portion, wherein the probe clamping portion is used for carrying testing probes and enabling the probes to be in close contact with a tested workpiece through certain coupling pressure; the probe clamping portion is connected with the PCS adjustment portion through an L-shaped connecting piece to realize accurate adjustment of probe spacing PCS; the PCS adjustment portion is connected with the three-dimensional portion through an L-shaped connecting piece to realize probe height adjustment, ultrasonic TOFD-B scanning and D scanning; the coupling water circulating portion is responsible for filling water in water spray probes to form a coupling water layer on a contact surface between the workpiece and the probes, and can realize cyclic utilization of coupling water. The water spray type automatic scanning device for ultrasonic TOFD nondestructive testing has the advantages that the ultrasonic intensity and signal stability can be kept during automatic scanning, the influence of human factors on testing results is reduced, the testing efficiency is improved and the wear of the probes due to direct contact between the probes and the workpiece is avoided.

Description

technical field [0001] The invention relates to the field of automatic ultrasonic non-destructive testing of welding seams or joints, in particular to a water spray automatic scanning device for ultrasonic TOFD non-destructive testing. technical background [0002] Ultrasonic diffraction time-of-flight technique (TOFD for short), its principle is based on the classical acoustic theory, namely: use the arrival time of the diffracted wave formed when the tip of the defect encounters the incident sound wave to measure the depth and determine the height of the defect. During the detection process, two longitudinal wave oblique probes are placed opposite each other, and the characteristic waveforms received by the detection probes include lateral waves, defect diffraction waves and bottom surface waves. The time difference of the above characteristic waveforms can be calculated to determine the depth and size of the defect. TOFD images based on A-scan signals have the advantages ...

AI Technical Summary

Problems solved by technology

However, when the detection speed is fast or non-ferromagnetic materials are detected, the wheels cannot be adsorbed on the workpiece, and the coupling between the probe and the workpiece and the stability of motion are difficult to guarantee; Lead to the deterioration of the quality of the inspection image, resulting in missed or misjudgment of defects

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