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A method for ultrasonic thickness measurement of coatings by Welch power spectrum is described. The multiple reflections of ultrasonic waves in coating layer lead to a series of maximum energy occurred in the Welch power spectrum which can be implemented to evaluate the thickness of coatings. A great of experiments verified it is effective and feasible to test nondestructively coating thickness on...
Residual stress has significant impacts on the performance of the pipe components, especially on its strength, fatigue life and corrosion resistance and dimensional stability. It has been a difficulty and hot issue that how to evaluate the residual stress status of the surface or a certain depth of tube components quickly, non-destructively and accurately. Based on acoustoelasticsticity theory, the...
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