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.
刘松平，李乐刚，刘菲菲，史俊伟. 大厚度扩散焊NLU成像检测技术*[J]. 航空制造技术, 2017, 60(5): 34-37.
LIU Songping, LI Legang, LIU Feifei, SHI Junwei. Evaluation of Thick Diffusion Bonds by Using NLU Imaging Method. Aeronautical Manufacturing Technology, 2017, 60(5): 34-37.
2017, 
