Abstract
Infrared thermographic nondestructive inspection of superplastically formed diffusion bonded (SPF/DB) titanium structures is discussed. Nondestructive testing (NDT) of the structures produced by this recently developed method is vital for construction of modern fighter aircraft. Forming and bonding parameters can be optimized by proper interpretation of NDT results. Currently, ultrasonic inspection is used for NDT on these parts. In an effort to reduce cost and inspection time required by ultrasonic testing, a thermographic investigation of panel response to rapid heating was undertaken. Panels were uniformly illuminated for a duration of up to four seconds by high intensity lamps. Infrared images of temperature variation due to panel thickness were observed. Correlation of thermograms with ultrasonic and destructive investigations indicate that lack of bonding and panel formations can easily be observed. We have demonstrated that thermographic inspection provides an equally sensitive and lower cost alternative to ultrasonic inspection. Finally, thermographic inspection facilities for large scale inspection are suggested.
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