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| Evaluation of Thick Diffusion Bonds by Using NLU Imaging Method |
| LIU Songping, LI Legang, LIU Feifei, SHI Junwei |
| (AVIC Composite Corporation Ltd., Beijing 101300, China) |
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Abstract Diffusion bonding (DB), as a solid state welding, has been increasingly applied in aeronautical and space
industries. The defects induced in thick DB plate are much more difficult to be found out by conventional ultrasonic techniques
because of their characteristics of kiss-bonding, small-size and distribution and high ultrasonic attenuation. A new
ultrasonic imaging technique, which is based on non-linear ultrasonic (NLU) components of the received signals resulted
from diffusion bonding interface, is developed into nondestructive evaluation (NDE) of thick diffusion bonded plate. The
experimental results show the powerful ability to the NDE of thick plate diffusion bonds by using the NLU visual method.
The maximum thickness of diffusion bonding is up to 70mm.
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2017, 
