Non-destructive testing system and method for a turbine disk using a dual linear array transducer

Abstract

The invention discloses a non-destructive testing system and method for a turbine disk using a bilinear array transducer. The detection system uses a computer stored with the Space-Defect method to collect ultrasonic echoes obtained from the bilinear array transducer. The image formed by the data is processed to obtain the defect-imaging point on the measured object. The invention adopts the Space-Defect method to solve the small defect characteristics less than half the wavelength that are not easy to be solved by conventional phased arrays. The Space-Defect method can be used for high-precision automatic identification and high-precision imaging of complex structure test pieces, which is an excellent solution for aviation superalloy disks. The detection of area-type defects in diffusion welding provides a new way.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, and more particularly refers to a non-destructive testing that can be performed on a turbine disk with a narrow gap. Background technique [0002] A transducer is an energy conversion device, and its performance description and evaluation require many parameters. The characteristic parameters of the transducer include resonance frequency, frequency bandwidth, electromechanical coupling coefficient, electroacoustic efficiency, mechanical quality factor, impedance characteristic, frequency characteristic, directivity, emission and reception sensitivity, etc. Transducers for different purposes have different requirements on performance parameters. For example, for transmitting transducers, the transducers are required to have large output power and high energy conversion efficiency; for receiving transducers, wide Frequency band and high sensitivity and resolution, etc. Therefore, ...

AI Technical Summary

Problems solved by technology

Aeronautical superalloy discs work under extreme conditions such as high speed, high load, high temperature, and high pressure for a long time. The weld zone is a stress concentration area. When defects occur, area defects such as micro-close gaps and microscopic distribution appear on the diffusion welding interface. Become a major safety hazard affecting the performance of aero-engines

The detection scheme based on the conventional single probe has the disadvantages of low detection resolution, low acoustic energy, and low imaging resolution. Therefore, it is of great practical significance to establish a detection method suitable for area-type defects of diffusion welding of superalloy disks.

Images