Sound attenuation
Ultrasonic attenuation is the loss of ultrasonic energy when passing through a material, due to absorption and scattering. It gives insights into microstructural changes, grain sizes, and pore densities.
Physical-Chemical Effect Mechanism
Ultrasonic waves are absorbed and scattered when passing through metals. Absorption depends on the material structure, grain size, and number of pores. The more pores and uneven grain, the stronger the attenuation.
Metallurgical Relevance & Risks in Welding
Attenuation gives important info about the structure and quality of the weld. Too much attenuation can indicate pores, cracks, or insufficient toughness. This can lead to component failure.
Workshop Practice & Instructions
Use ultrasonic testing (UT) before and after welding to check the structure quality. Watch for homogeneous grain and minimal porosity. If you see unusually high attenuation, inspect the weld and repair it if needed.