Method for collecting surface wave and creeping wave of ultrasonic flaw detector

Abstract

The invention discloses a method for collecting a surface wave and a creeping wave of an ultrasonic flaw detector, relating to an apparatus collecting method. The apparatus comprises an ultrasonic flaw detector which detects the flaw of a work piece by transmitting the ultrasonic wave through a probe head, wherein the detected distance of the flaw of the work piece is the sum of practical distance and corrected distance. The method sequentially comprises the following steps of: preparing a standard test block for correcting the probe head, and the surface wave or the creeping wave probe head for the ultrasonic flaw detector; leading the probe head to move on the test block back and forth till that the ultrasonic flaw detector displays that the surface wave and the creeping wave generate highest reflected wave at the flaw of the standard test block so as to obtain the distance S from an ultrasonic wave-transmitting end in the probe head to the flaw; detecting the distance L from the headmost end of the probe head to the flaw; and subtracting L from S to obtain the correcting distance for correcting ultrasonic flaw detector. The method fills in gap that the existing ultrasonic flaw detector is difficult to correct the front edge of the transverse wave (the surface wave and the creeping wave) probe head and the route of the ultrasonic wave in the probe head.

Description

technical field [0001] The invention relates to an instrument calibration method, in particular to a surface wave and creeping wave calibration method for an ultrasonic flaw detector. Background technique [0002] At present, when ultrasonic flaw detectors are used for surface wave or creeping wave flaw detection of workpiece defects, ultrasonic waves are emitted through the probe to detect workpiece flaws. The detected workpiece defect distance is the sum of the actual distance and the calibration distance, where the calibration distance is the ultrasonic wave in the probe. The sum of the sound path a traveled by the interior and the sound path b that the ultrasonic wave propagates on the surface of the workpiece but is covered by the probe shell. At this time, in order to obtain the actual distance of the workpiece defect, the flaw detector can only calculate the flaw position according to the data provided by the probe manufacturer. The value of the internal sound path a...

AI Technical Summary

Problems solved by technology

At this time, in order to obtain the actual distance of the workpiece defect, flaw detectors can only manually calibrate and calculate the defect position according to the data provided by the probe manufacturer. The value of the internal sound path and the front edge of the probe will change. After such a situation occurs, because other instruments cannot automatically detect these two values, workers can only calculate according to the data given by the manufacturer, and the defect location found will be different. error occurred

Or in some factories, after using the probe for a period of time, in order to ensure the accuracy of the probe, they have to scrap the probe and buy a new probe, which greatly increases the production cost of the factory.

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