Electric heating – Metal heating
Reexamination Certificate
2008-05-13
2008-05-13
Kerns, Kevin P. (Department: 1793)
Electric heating
Metal heating
C228S230000, C228S232000, C228S248100, C148S521000
Reexamination Certificate
active
07371988
ABSTRACT:
In one embodiment, the present invention provides a method for welding together two metal pieces, comprising buttering a surface of a first metal piece with a first nickel-based filler metal at a thickness sufficient to isolate a heat-affected zone in the first metal piece from subsequent welding; heat-treating at least the heat-affected zone in the first metal piece; buttering a surface of a second metal piece with a second nickel-based filler metal having the same composition as the first nickel-based filler metal and at a thickness sufficient to isolate a heat-affected zone in the second metal piece from subsequent welding; heat-treating at least the heat-affected zone in the second metal piece; and welding the heat-treated first buttered surface to the heat-treated second buttered surface with a third nickel-based filler metal having the same composition as the first and second nickel-based filler metals.
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Coleman Kent K.
Gandy David Wayne
Viswanathan Ramaswamy
Electric Power Research Institute Inc.
Kerns Kevin P.
Kilpatrick & Stockton LLP
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