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Erscheinungsjahr
- 2009 (12) (entfernen)
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Schlagworte
- Visualization (3)
- Anisotropic weld (2)
- Electrodynamic probe (2)
- Nickel alloy (2)
- Nondestructive testing (2)
- Sound field (2)
- Ultraschall (2)
- Ultrasonic (2)
- Acoustic propagation (1)
- Anisotropic media (1)
Eingeladener Vortrag
- nein (4)
When dealing in ultrasonic testing with
inhomogeneous material structure data interpretation can be
rather difficult. This is especially the case when using anisotropic
dissimilar welds made from austenitic steel or nickel based alloys,
which are currently used for modern power plant concepts. In
this work we present an electrodynamic technique to visualize
sound waves with frequencies up to 3 MHz in steel components
providing a simple use and a high signal-to-noise ratio. By
detecting the grazing beam with an electrodynamic probe, we
measured the particle displacement as a function of time with a
spatial resolution in the order of 1 mm. Adapting the
electrodynamic probe and its coil alignment allows for measuring
the displacement components in all three dimensions. This
comprises the detection of the horizontal and vertical particle
displacement with respect to the surface and thus also the
transformation from longitudinal waves into transversal waves
and vice versa. We report on measurements of the sound field in
a complex narrow-gap weld, joining a nickel alloy with a chrome
steel with a substantial anisotropy of the weld structure. The test
system enables us to visualize the wave propagation within the
weld and indicates the reflection scenario and the energy losses
due to both the anisotropic structure and material defects.