Water immersion ultrasonic flaw detection method for rolled steel defects

Abstract

The invention provides a water immersion ultrasonic flaw detection method for rolled steel defects, and belongs to the technical field of water immersion ultrasonic nondestructive detection. The thicknesses of water layers of all focus probes are different; the focus probes are fixed on a water immersion ultrasonic flaw detector by fixtures, a plurality of focus probes are controlled to move together by software, each focus probe can be guaranteed to scan a scanning area of to-be-tested rolled steel once, the scanned results of all the focus probes are displayed on a computer separately, thenthe scanned results of all the focus probes are synthesized, and whether the to-be-tested rolled steel has defects can be analyzed more accurately. Because focus points of all the focus probes are distributed in the thickness direction of the to-be-tested rolled steel and signals near the focus points are much stronger than signals at other positions of a sound beam, the scanning signals of the focus probes can be effectively enhanced by the method and the detection results are 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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