Bit leg and cone hardfacing for earth-boring bit

Details Bit leg and cone hardfacing for earth-boring bit Bit leg and cone hardfacing for earth-boring bit

2006-03-16

2009-11-24

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S425000

Reexamination Certificate

active

07621347

ABSTRACT:
An earth-boring bit has a bit body, and a bit leg depending from the bit body with a circumferentially extending outer surface, a leading side and a trailing side. A cone is rotatably mounted on a cantilevered bearing shaft depending inwardly from the bit leg. A first layer of a hardfacing composition of carbide particles dispersed in a nickel-based matrix is formed on the bit leg. A second layer of a hardfacing composition of carbide particles dispersed in an iron-based matrix that is formed on the cone. The first layer of hardfacing is applied by conveying carbide particles in a nickel-based matrix through a pulsed plasma transferred arc process. The second layer of hardfacing is applied with a torch and a hardfacing tube comprising carbide particles held within an iron-based tube.

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Plasma Transferred Arc Overlays Reduce Operating Costs in Oil Sand Processing, D. Harper, M. Gill, K.W.D. Hart, Eutectic Canada Inc., Edmonton, Alberta, Canada—M. Anderson, Syncrude Canada Ltd., Edmonton, Alberta, Canada, 7 pages.
Effects of Microstructure on Wear of WC/NI PTA Coatings, J.W. Newkirk and J. Bao, U. of Missouri-Rolla, Rolla, MO, pp. 563-569.

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