A water immersion ultrasonic flaw detection method for defects in rolled steel

Abstract

The invention provides a water immersion ultrasonic flaw detection method for rolling steel defects, belonging to the technical field of water immersion ultrasonic nondestructive testing. In the present invention, the thickness of the water layer of each focusing probe is different, the focusing probe is fixed on the water immersion ultrasonic flaw detector by the fixture, and the multiple focusing probes are controlled by software to move together to ensure that each focusing probe can The scanning area of ​​the steel is scanned once, and the scanning results of each focusing probe are displayed on the computer, and then the scanning results of each focusing probe are combined to more accurately analyze whether there is Defect, because the focal points of each focusing probe are distributed in the thickness direction of the rolled steel to be tested, the signal near the focal point is much stronger than other positions of the sound beam, so the scanning signal of the focusing probe can be effectively enhanced by the method of the present invention, Make the detection result more accurate.

Description

Technical field: [0001] The invention belongs to the technical field of water immersion ultrasonic nondestructive testing, and in particular relates to a water immersion ultrasonic flaw detection method for defects in rolled steel products. Background technique: [0002] Ultrasonic non-destructive testing technology began in the 1930s and has achieved rapid development since its development. It has been applied to almost all industrial fields and plays an important role in domestic economic development and construction. At present, ultrasonic non-destructive testing technology is the most widely used, most frequently used and fastest-growing non-destructive testing technology at home and abroad. [0003] Ultrasonic flaw detection of steel is a more commonly used method to detect the quality of steel. Compared with other detection methods, ultrasonic flaw detection has many advantages, such as: it can detect without damaging the workpiece, no pollution, harmless to the human ...

AI Technical Summary

Problems solved by technology

However, the signal strength of water immersion ultrasonic testing is very weak, and it is often necessary to adjust the gain of the attenuator to a high level to find the defect echo in the workpiece. According to experimental research, when using the same probe, the signal strength of water immersion ultrasonic testing is the same as that of The signal strength difference of the water grinding method is about 20dB

Therefore, focusing probes are generally used to increase signal strength in water immersion testing. Although this method can increase signal strength to a certain extent, the actual detection effect is not very ideal due to the uneven distribution of the sound beam of the focusing probe.

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