Metal fusion bonding – Process – Using dynamic frictional energy
Reexamination Certificate
2011-01-25
2011-01-25
Stoner, Kiley (Department: 1793)
Metal fusion bonding
Process
Using dynamic frictional energy
C428S544000
Reexamination Certificate
active
07874471
ABSTRACT:
Provided are butt welds and methods of making such butt welds using a combination of fusion root welding and friction stir welding to yield welds with decreased propensity for dropout during friction stir welding without the need for a back-up support plate. In one form of the present disclosure, the butt weld includes: two or more abutting structural steel components beveled on faying surfaces on one side of the components to form a suitably shaped fusion root weld groove and unbeveled on faying surfaces on the opposite side of the components and interconnected with a first fusion root weld on the beveled side of the components and a second friction stir weld on the unbeveled side of the components, wherein the first fusion root weld has a width ranging from 7 mm to 30 mm, a penetration depth ranging from 2 mm to 20 mm, and an overfill ranging from 2 mm to 5 mm, and wherein the stir zone of the second friction stir weld penetrates the first fusion root weld. The butt welds and methods of making find application in joining linepipe for oil and gas production.
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Co-pending commonly owned U.S. Appl. No. 12/590,956, filed Nov. 17, 2009.
Biery Nicholas E.
Fairchild Douglas Paul
Ford Steven Jeffrey
Kumar Amit
Macia Mario L.
ExxonMobil Research and Engineering Company
Migliorini Robert A.
Stoner Kiley
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