Drill pipe manufacture

Details Drill pipe manufacture Drill pipe manufacture

1977-11-14

1979-04-24

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148150, C21D 166

Patent

active

041510186

ABSTRACT:
A tool joint is friction welded to one end of a tube. The weld area cools in air as the pipe moves to a tempering station.
When the weld is below a temperature corresponding to 90% transformation from austenite to martensite, an infrared radiation responsive control viewing the weld causes an induction heating coil to be moved axially onto the end of the pipe to reheat the weld area to a temperature below austenitizing but sufficient to temper the steel, and an infrared radiation responsive control viewing the pipe radially through a radial view passage in the coil deenergizes the coil and causes it to be withdrawn. The weld is then machined off inside and outside. The weld area is next heated to austenitize the steel, following which it is fluid quenched.
At a second tempering station the pipe end is moved axially into an induction heating coil to reheat the weld area. An infrared radiation responsive control viewing the weld obliquely through a slot in the coil's inner periphery deenergizes the coil at the prescribed temperature. The pipe end is then withdrawn from the coil and allowed to cool in the air.

REFERENCES:
patent: 3587268 (1971-06-01), Bricmont
patent: 3614366 (1971-10-01), Huchok
patent: 3755010 (1973-08-01), Moliterno
patent: 3824366 (1974-07-01), Garnier
patent: 3933534 (1976-01-01), Ettenreich et al.
patent: 3997374 (1976-12-01), Dill et al.
patent: 4001054 (1977-01-01), Makepeace

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