Drill rod and method of manufacture thereof

Details Drill rod and method of manufacture thereof Drill rod and method of manufacture thereof

2005-03-24

2009-08-11

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

With tool shaft detail

C076S108200

Reexamination Certificate

active

07571779

ABSTRACT:
A drill rod for percussive rock drilling includes a first rod part and an additional second rod part. The first rod part includes first and second ends, an inner duct, and an external thread disposed adjacent the first end, wherein the external thread is at least partly hardened by heat treatment. The additional rod part includes first and second ends, an inner duct, and an internally thread disposed adjacent the first end thereof, wherein the internal thread is at least partly hardened by heat treatment. The first ends of the respective first and second rod parts are threadedly secured to one another, and the second ends of the respective first and second rod parts are welded together to define a weld zone having a substantially martensitic structure. If there is further provided an intermediate hollow rod part, then the second ends of the respective first and second rod parts would be welded to respective ends of the intermediate hollow part to define weld zones having a substantially martensitic structure.

REFERENCES:
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patent: 6095266 (2000-08-01), Lundell
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patent: 2006/0118340 (2006-06-01), Wahlstrom et al.
patent: 2026044 (1980-01-01), None
patent: WO 97/49520 (1997-12-01), None
patent: WO 01/42615 (2001-06-01), None

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