Metal fusion bonding – Process – Using dynamic frictional energy
Reexamination Certificate
2011-08-16
2011-08-16
Stoner, Kiley (Department: 1735)
Metal fusion bonding
Process
Using dynamic frictional energy
C228S245000
Reexamination Certificate
active
07997472
ABSTRACT:
When a friction stir weld tool penetrates the interface of two workpieces of dissimilar metal alloy materials, the resultant weld of the different alloy materials may produce a weak weld joint. Such weak joints are often experienced, for example, when attempting to form spot welds or other friction stir welds between a magnesium alloy sheet or strip and an aluminum alloy sheet or strip. It is discovered that suitable coating compositions including an adhesive placed at the interface of assembled workpieces can alter the composition of the friction stir weld material and strengthen the resulting bond. In the example of friction stir welds between magnesium alloy and aluminum alloy workpieces, it is found that combinations of an adhesive with copper, tin, zinc, and/or other powders can strengthen the magnesium-containing and aluminum-containing friction stir weld material.
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Chen Yen-Lung
Chimbli Sri Krishna
Hall Mark T.
Szymanski Robert T.
Gamino Carlos
GM Global Technology Operations LLC
Reising Ethington P.C.
Stoner Kiley
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