Surface smoothed tool joint hardfacing

Details Surface smoothed tool joint hardfacing Surface smoothed tool joint hardfacing

1977-04-25

1981-01-06

Padgett, Benjamin R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

219 77, 219 7614, 219 7615, 175374, 428627, 428935, 175375, B22F 704

Patent

active

042437270

ABSTRACT:
A tool joint hardfacing containing sintered tungsten carbide granules embedded in an alloy steel matrix, with the surface substantially free of protruding granules to decrease casing wear during well drilling. The hardfacing is applied in a single application by rotating the drill pipe, providing an arc between a consummable steel wire and the pipe to create a weld puddle, and reciprocating the wire parallel to the pipe axis to create a band. Sintered tungsten carbide granules are gravity fed from an orifice directly into the arc and precipitate toward the bottom of the matrix to provide a smooth surface. The bottom of the matrix appears to be harder than the top.

REFERENCES:
patent: 3334975 (1967-08-01), Quaas
patent: 3715999 (1973-02-01), Schwayder
patent: 4055742 (1977-10-01), Brown

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