Compressor impeller defect phased array ultrasonic detection method

Abstract

The invention relates to a compressor impeller defect phased array ultrasonic detection method. The method comprises 1, connecting a probe and a detected wedge by a coupling agent, putting the connected probe and detected wedge into a through hole in a compressor impeller so that the connected probe and detected wedge tightly cling to a cylindrical inner wall, and coating parts between the detected wedge and the cylindrical inner wall with the coupling agent, 2, setting a focus scanning mode as a detection mode of a phased array ultrasonic detection device, and 3, setting a scanning depth of the phased array ultrasonic detection device as the largest thickness of a compressor impeller wheel disc, stimulating 8 or 16 wafers in each group, carrying out detection, and after one detection process, recording and storing the detection result. The detection method realizes detection of wheel disc and blade root internal defects, prevents a detection blind area caused by a complex structure, reduces a residual error rate and has high defect positioning accuracy.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to the technical field of phased array ultrasonic testing of compressor impeller defects. Background technique [0002] The compressor impeller is an important part of the blower unit, which converts mechanical energy into internal energy and kinetic energy of gas through high-speed rotation during service. Structurally, blades and discs are important components of the impeller. [0003] The compressor impeller converts mechanical energy into internal energy and kinetic energy of gas through high-speed rotation during service. Due to the complex service environment of the impeller, it bears alternating loads such as huge centrifugal force, bending stress, and vibration stress, and is prone to fatigue cracks and erosion wear. The macroscopic cracks and erosion wear on the surface of the impeller can be directly observed with the naked eye; however The internal cracks, pores, ...

AI Technical Summary

Problems solved by technology

[0005] With the rapid development of today's science and technology, phased array ultrasonic testing has been widely used in industrial testing. However, the geometry of the impeller is relatively complex. The method has great limitations, which brings great difficulties to the actual detection

The main difficulties are 1) the probe of the phased array ultrasonic testing in the prior art can only be placed on the surface of the wheel disc, and it is not clear whether it can fully detect the entire impeller if it is placed in this position; 2) the probe wedge is relatively large Or the shape does not match the shape of the impeller surface, and the probe wedge cannot be placed on many impeller surface parts; 3) Phased array ultrasonic testing has a variety of scanning methods, which scanning method is suitable for the detection of impellers, and what parameters are used for detection. There is no record in the technology

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