Identification of Structural Defects of Metal Composite Castings with The Use of Elastic Waves

[摘要] The method of elastic wave propagation was applied to detect defects in composite castings (ingots). If a defect occurs, which is detected by the radiography, elastic wave propagation changes locally, i.e. causes disturbance of elastic wave propagation. Methods of signal analysis based on wavelet decomposition were used. Calculations related with wavelet analysis were made in the MATLAB environment using standard Wavelet Toolbox functions.

[学科分类] 金属与冶金

[关键词] Keywords: acoustic emission;wavelet transform;quality of composite castings