Ultrasonic flaw detection defect location method and ultrasonic flaw detector

Abstract

The invention relates to the technical field of ultrasonic flaw detection, and in particular relates to an ultrasonic flaw detection defect location method and an ultrasonic flaw detector. The ultrasonic flaw detector comprises an echo detection circuit, wherein the echo detection circuit is connected to an ultrasonic probe; the ultrasonic probe is fixedly connected to a support; the support is provided with a reference substance linking along with the ultrasonic probe. The first shortest distance from the ultrasonic probe to a welding seam remote side line is obtained by utilizing the reference substance, and positional information of a reflection point relative to a welding seam cross section, namely the position of a flaw relative to the welding seam cross section, can be directly obtained by contrasting the first shortest distance from the ultrasonic probe to the welding seam remote side line with a second shortest distance from the ultrasonic probe to the reference substance and then matching with the depth of the reflection point, so that the detection workload of site flaw detection is reduced, the dependence on subjective judgment of operators is reduced, and the error rates of flaw position misjudgment and characteristic misjudgment are reduced.

Description

Technical field [0001] The invention relates to the technical field of ultrasonic flaw detection, in particular to an ultrasonic flaw detection defect positioning method and an ultrasonic flaw detector. Background technique [0002] At present, the welding seam detection of metal workpieces mostly adopts ultrasonic flaw detection method. Ultrasonic flaw detection is a method that uses ultrasonic energy to penetrate deep into the metal workpiece, and when one medium enters another medium, it can reflect on the interface to find defects. When the ultrasonic beam emitted by the probe meets inside the metal workpiece When a defect is reached, a reflected wave will be generated and a pulse waveform is formed on the phosphor screen. According to the position, height and dynamic form of these pulse waveforms, the position and equivalent of the defect can be judged and its nature can be further estimated. (Defect equivalent means that the return sound pressure of different types and siz...

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Problems solved by technology

) However, this judgment generally requires the inspector to carry out multiple inspection operations, combined with experience, it takes a long time and depends on the subjective judgment of the operator, and the reliability is poor

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