Surface smoothed tool joint hardfacing with grindable tie-in

Details Surface smoothed tool joint hardfacing with grindable tie-in Surface smoothed tool joint hardfacing with grindable tie-in

H - Electricity

05

B

327/60

H05B 7/18 (2006.01) B23K 9/04 (2006.01) B23K 31/02 (2006.01) C23C 4/06 (2006.01)

Patent

CA 1118847

ABSTRACT OF THE DISCLOSURE An improved method for hardfacing tool joints for earth boring drill pipe. Annular bands of hardfacing are ap- plied by an apparatus that creates an arc between a consumable steel wire and the tool joint. The steel wire is reciprocated across the width of the band as the tool joint is rotated. Granules of tungsten carbide flow by gravity from a hopper into the weld puddle. The flow of granules into the puddle is stopped just prior to reaching the tie-in point. The arc con- tinues a short distance, creating an overlapping protuberance at the tie in that is free of granules at the surface. This pro- tuberance can be easily ground smooth with the remainder of the hardfacing. -2-

331625

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