HARDFACING AROUND BALL LOADING HOLE FOR EARTH-BORING BIT

摘要

A rotary cone earth boring bit has at least one bit leg (17) with a cone retaining ball passage (35) that intersects an outer surface of the bit leg and is closed by a ball plug (37). An upwardly curved lower hardfacing bead (41) is on the outer surface of the bit leg at least partially below the ball plug. A downwardly curved upper hardfacing bead (47) is on the outer surface of the bit leg at least partially above the ball plug. The upper hardfacing bead has leading and trailing ends that join the lower hardfacing bead. The upper and lower hardfacing beads define a generally elliptical perimeter (49) surround the ball plug. At least one transverse bead (53) is above the upper hardfacing bead and leads generally upwardly and circumferentially from a leading edge of the bit leg to a trailing edge of the bit leg.