Drill rod and method for its manufacture

Details Drill rod and method for its manufacture Drill rod and method for its manufacture

1997-06-20

1999-11-23

Neuder, William

Boring or penetrating the earth

With tool shaft detail

175425, E21B 1716

Patent

active

059883014

ABSTRACT:
A rock drilling rod is manufactured by placing free ends of first and second hollow rod components in abutment, and establishing relative rotation between the free ends to friction weld those free ends together. The first component comprises a thread and a clearance portion disposed adjacent the thread. The first component has a hot hardness value of at least about 170 HV1 at 600.degree. C. Prior to friction welding the components together, the thread, clearance portion and central passage of the first component are nitrocarburized against corrosion fatigue. Following the nitrocarburizing, the core hardness is at least 440 HV1. Following the welding, the weld is cooled while keeping a core hardness of the respective portions of the first and second components disposed immediately adjacent the weld no lower than 390 HV1.

REFERENCES:
patent: 4625814 (1986-12-01), Helasuo et al.
patent: 5209311 (1993-05-01), Donse

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