Ultrasonic tandem probe device and method

Abstract

The invention belongs to the technical field of research on a nondestructive flow detection device and relates to an ultrasonic tandem probe device and an ultrasonic tandem probe method. The crack defects of casting and welding pieces thereof are detected by mainly utilizing ultrasonic wave. Two probes are adopted, one of the probes emits a signal and is an emitting probe, and the other one receives the signal and is a receiving probe; the emitting probe emits ultrasonic wave; when the ultrasonic wave encounters the crack defects, waveform received by an oscilloscope screen is changed; in thedetection process, the ultrasonic wave emitted by the emitting probe forms end-point diffraction wave at the end-point position of the crack, the receiving probe receives the diffraction wave and performs continuous detection in different directions, and the diffraction wave is maximal when the two probes are symmetrical about the plane on which the cracks are; and the maximal amplitude is captured on the oscilloscope screen, sound velocity and sonic path distance are measured, and the position and the depth of the crack are determined.

Description

technical field [0001] The invention belongs to the technical field of non-destructive flaw detection device research, and relates to an ultrasonic serial probe device and method, mainly using ultrasonic waves to detect crack defects in castings and welded parts. Background technique [0002] Ultrasonic testing is a type of non-destructive testing used to detect defects inside workpieces. Without destroying the structure and performance of the test workpiece, the ultrasonic reflection, transmission, diffraction, resonance and other characteristics are used to detect defects such as pores, inclusions, shrinkage cavities, and cracks inside the workpiece. Fracture mechanics studies have shown that defects with planar features, such as cracks, lack of fusion, etc., are extremely harmful, and crack propagation inside the workpiece may have catastrophic consequences for pressure vessels. Therefore, in order to eliminate crack defects, it is particularly important to accurately me...

AI Technical Summary

Problems solved by technology

Due to the low measurement accuracy of the shear wave endpoint reflection echo method and the large error in the detection of shallow surface cracks, the scope of application is limited; the shear wave relative sensitivity method determines the indicated value by reducing the highest amplitude measured by 20dB, which has a large error with the actual defect characteristics , cannot accurately reflect the actual depth of the defect

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