US Patent 7552783 Graded hardfacing for drill bits
Patent 7552783 was granted and assigned to Smith International on June, 2009 by the United States Patent and Trademark Office.
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A drill bit including a bit body having an upper end adapted to be detachably secured to a drill string and at least one leg at its lower end, each leg having a downwardly and inwardly extending journal bearing, at least one roller cone mounted on each journal bearing, at least one cutting element disposed on the at least one roller cone; and a hardfacing overlay on at least a portion of at least one of an inner surface of the at least one roller cone and a surface of the journal bearing, wherein a composition of the hardfacing overlay proximate an outside surface of the hardfacing overlay is different from a composition of the hardfacing overlay proximate an interface between the hardfacing overlay and the at least a portion of at least one of the inner surface of the at least one roller cone and the surface of the journal bearing is disclosed.
US Patent 07552783 Graded hardfacing for drill bits US Patent 7552783 Graded hardfacing for drill bits
US Patent 07552783 Graded hardfacing for drill bits
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