A water immersion ultrasonic flaw detection method

Abstract

The invention provides an immersion type ultrasonic flaw detection method, which is applied to flaw detection of workpieces. The method comprises the steps that an ultrasonic probe is used for acquiring the focus position of a workpiece at the initial position, and carrying out flaw detection on the workpiece at current focus position; ultrasonic detection equipment is used for analyzing the acquired current focus position to acquire the next focus position of the workpiece in the ultrasonic probe moving direction; a position control command is formed according to the current focus position; the ultrasonic probe is controlled to move to the detecting position corresponding to the current focus position according to the position control command; and the ultrasonic detection equipment is used for executing flaw detection on the detecting position corresponding to the current focus position, and keeping on flaw detection on the workpiece. The technical scheme of the immersion type ultrasonic flaw detection method has the beneficial effect of overcoming the defect in the prior art that the flaw detection accuracy is influenced since the distance between the probe and the workpiece surface fluctuates and the probe focus fluctuates relative to the workpiece surface when the probe and workpiece make relative movement.

Description

technical field [0001] The invention relates to the field of workpiece flaw detection, in particular to a water immersion ultrasonic flaw detection method. Background technique [0002] Ultrasonic flaw detection is an important flaw detection method in non-destructive testing. It uses the principle that ultrasonic waves will produce echoes of different heights when they enter medium layers with different sound velocities to judge whether there are defects on the surface and interior of the workpiece to be tested. A common ultrasonic flaw detection device is a water immersion automatic ultrasonic flaw detector, which immerses the ultrasonic probe in water and uses water as a coupling agent for material flaw detection. During flaw detection, the workpiece is placed under the probe in the water, and the probe and the workpiece make relative motion to detect the workpiece. Defects, in the existing flaw detection equipment, due to the processing problem of the workpiece surface, ...

AI Technical Summary

Problems solved by technology

A common ultrasonic flaw detection device is a water immersion automatic ultrasonic flaw detector, which immerses the ultrasonic probe in water and uses water as a coupling agent for material flaw detection. During flaw detection, the workpiece is placed under the probe in the water, and the probe and the workpiece make relative motion to detect the workpiece. Defects, in the existing flaw detection equipment, due to the processing problem of the workpiece surface, or the water tank containing the workpiece has a certain inclination angle, the distance between the probe and the workpiece surface will fluctuate when the probe and the workpiece are in relative motion, and the focus of the probe The surface of the relative workpiece also fluctuates, which affects the accuracy of flaw detection

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