Application of Solid State Welding and Superplastic Forming to Aerospace Vehicles

Paper #:
  • 2017-01-2148

Published:
  • 2017-09-19
Abstract:
This study presents some of current works in manufacturing launcher structural components with solid state welding and superplastic forming technology. The adoption of superplastic characteristics into manufacturing process makes many of aerospace components lighter and stiffer, since aerospace vehicle requires lightweight structures to obtain weight saving for increasing payloads and fuel efficiency. Some of titanium alloys, aluminum alloys and super alloys are typical examples of superplastic materials that have been used to produce complex shapes of aerospace components. The optimum strain rate sensitivity and strain rate range were obtained from biaxial bulging test and this parameters were used to manufacture the components with superplastic blow forming using hydrostatic gas pressure difference. The results includes Al-Li alloy cylindrical tank for aerospace cryogenic application, titanium lightweight panel, and hollow cone structure of superalloy manufactured by superplastic forming and combined diffusion bonding or friction stir welding. For cylindrical tank of Al-Li alloy, the forming temperature was 460℃ to form a complete hemispherical dome with diameter of 350 mm for 3,420 sec. Manufacturing of the complex shape of aerospace components was successfully demonstrated using these technologies.
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