Acoustic Impedance Jump Analysis
Acoustic impedance discontinuity analysis measures amplitude reflections at material boundaries to quantify layer thickness and bond defects.
Physical-Chemical Mechanism
The acoustic impedance discontinuity analysis uses differences in sound characteristic impedance between materials. At a discontinuity at a material boundary, a sound reflection occurs, whose amplitude is measured.
Metallurgical Relevance & Welding Risks
This analysis helps in testing layers and bonds in weld zones. A high impedance discontinuity can indicate lack of fusion or incomplete penetration, which can lead to cracks or joint problems.
Workshop Practice & Action Items
Use an ultrasonic device for measurement. Set the frequency so it penetrates the material. Analyze the reflection amplitudes at the interfaces and compare with reference data. A jump of more than 20 dB indicates a bond defect.