ULTRASONIC RING WELDING OF HERMETIC COVERS OVER FASTENER HEADS ON AIRCRAFT SURFACES.
Final research rept.
AEROPROJECTS INC WEST CHESTER PA
Pagination or Media Count:
The feasibility of installing covers over aircraft fasteners by ultrasonic ring welding, in order to protect the aluminum skinsteel bolt interface from corrosive atmosphere, was demonstrated. Existing ultrasonic equipment was adapted along lines of expediency for use on an aircraft surface, and a spot-facing tool was aligned with the welder to provide the flat surface required for ultrasonic welding. About 25 covers of 0.005-inch aluminum 1145-H19 were sealed over main structural fasteners on a wing panel. All seals were leaktight to helium at a sensitivity of 1 x 10to the minus 9th power ccsec. Test panels were prepared to simulate the processing used on the wing and forwarded to the Navy for fatigue-corrosion testing. Design criteria were established and conceptual layouts prepared for prototype equipment for ultrasonically welding covers over an entire aircraft at Navy overhaul stations. Author
- Fabrication Metallurgy