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US 2002/0157873 A1Published application
Method for hardfacing roller cone drill bit legs
AssigneeSmith International, Inc.
InventorsJohn Ramsay Crowe, Angus Greig, Robert Hamilton, Gary Farquhar, Kevin Angus
Life of this patent
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Abstract
A method is disclosed for applying hardfacing to a shirttail portion of a roller cone drill bit, including masking around the shirttail portion of the bit and operating a high pressure/high velocity oxygen fuel torch to apply the hardfacing to the shirttail portion.
Claims13
A method for applying hardfacing to a shirttail portion of a roller cone drill bit, comprising:
- masking around the shirttail portion;
- operating a high pressure/high velocity oxygen fuel torch to apply the hardfacing to the shirttail portion.
A roller cone drill bit, comprising:
- a bit body adapted to be coupled to a drill string, the bit body including at least one leg depending therefrom, the leg having a bearing journal thereon, the leg defining a shirttail portion at an end thereof;
- a roller cone having cutting elements thereon and rotatably affixed to the at least one bearing journal;
- and
- a hardface coating applied to the shirttail portion, the hardface coating applied by a high pressure/high velocity oxygen fuel torch.
1 more element
Dependencies are inferred from the claim text.