Subsurface focused ultrasound water immersion detection method

Abstract

The invention relates to a subsurface focused ultrasound water immersion detection method. The method comprises the steps that a to-be-detected workpiece is put into an ultrasound water immersion detection system; the size of the detection surface of the to-be-detected workpiece is determined, the distance h between an ultrasound probe of the ultrasound water immersion detection system and the to-be-detected workpiece is adjusted, and the distance h is smaller than the focal distance H of the ultrasound probe; the to-be-detected workpiece is detected, a scanning image is obtained, and subsurface focused ultrasound water immersion detection is completed. By decreasing the distance h, namely, water distance, from the ultrasound probe to the surface of the to-be-detected workpiece, and a ultrasound probe detection mode is turned to be a subsurface focusing mode from a surface focusing mode; by means of the subsurface focused ultrasound water immersion detection method, the problem that the clutter level is high in the actual detection process can be solved, the clutter detection level is effectively decreased, the detection signal-to-noise ratio is increased, and the detection quality is guaranteed. The method is simple, rapid and easy to implement.

Description

[0001] 【Technical field】 [0002] The invention belongs to detection technology and relates to a subsurface focused ultrasonic water immersion detection method. [0003] 【Background technique】 [0004] Ultrasonic water immersion focusing detection method has been widely used in the detection of aero-engine parts because it is less affected by human factors and has high detection reliability. For example, the IHM point focusing probe is used in the water immersion ultrasonic inspection of certain engine disc forgings, the frequency is 5MHz, and the water distance (the distance between the ultrasonic probe 1 and the surface of the workpiece 2 to be inspected) usually adopts a nominal focal length of 150mm, such as figure 1 As shown, the focus of the probe just falls on the surface of the workpiece at this time, and the use of the probe is surface focusing. However, the clutter levels in the A-scan and C-scan images collected after detecting the disk-like forgings according to th...

AI Technical Summary

Problems solved by technology

However, the clutter levels in the A-scan and C-scan images collected after detecting the disk-like forgings according to the surface focusing method are often higher than 20%, such as figure 2 and image 3 As shown, it is difficult to separate the defect signal to be tested, and the signal-to-noise ratio is poor, which brings difficulties to the flaw detection work.

Therefore, in order to solve the problem of high clutter level in the ultrasonic testing process of such forgings, it is necessary to improve the original testing process to ensure the testing quality

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