Metal fusion bonding – Process – With shaping
Patent
1998-12-22
2000-10-31
Ryan, Patrick
Metal fusion bonding
Process
With shaping
228193, 294211, 29897, 428178, 527831, 5279311, B21D 4702, B21K 2300, B23K 2000, B32B 312
Patent
active
06138898&
ABSTRACT:
A method of making an monolithic metallic sandwich structure includes selecting at least two chemically clean metal core sheets having superplastic characteristics and placing them face-to-face. The core sheets are welded together into a core pack along intersecting lines that will form junction lines of webs defining cells between the core sheets when the core pack is expanded superplastically. Gaps are left adjacent to the intersections of the weld lines to produce openings through which gas can pass to pressurize each cell. The position of the gaps adjacent the weld line intersections minimizes strain on the marginal regions around the openings as the core pack is inflated, to reduce the tendency of the sheets to tear or rupture around the openings. A gas pressure line fitting is inserted between one edge and the core pack is welded around its periphery with the gas fitting protruding from the edge for connection to a gas source that will purge and pressurize the core pack with gas. Two chemically cleaned metal face sheets having superplastic characteristics are placed over and under the core pack, and all four sheets are peripheral seal welded to produce a sealed envelope pack enclosing the core pack, with gas fittings into the core pack and into a face sheet zone between the face sheets and the core pack. Dry Argon is admitted through the gas fittings to purge air and moisture from the packs and then to pressurize the packs to a low pressure to maintain separation of the sheets while heating to prevent premature diffusion bonding. The full pack is placed in an internal cavity of a heated die and is raised to superplastic temperatures. Forming gas is injected through the fittings at a forming pressure sufficient to inflate the envelope pack to the interior walls of the cavity, and inflate the core pack to the envelope pack and to diffusion bond the face sheets to the core sheets. After forming, the die is opened and the formed pack is removed.
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Glenn Gary S.
Will Jeffrey D.
Young Gerould K.
Neary J. Michael
Ryan Patrick
Stoner Kiley
The Boeing Company
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