Method for producing hardened flutes in a kelly bar

Details Method for producing hardened flutes in a kelly bar Method for producing hardened flutes in a kelly bar

1995-06-05

1997-01-14

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23K 9013

Patent

active

055936032

ABSTRACT:
A method for processing a carbon steel body by electric arc gouging with a carbon electrode to create flutes with a hardened heat zone containing finely dispersed martensite beneath the bottom surface of each flute. This process can form a kelly bar having hardened flutes for improved wear. Preferably the carbon steel body composition is according to the AISI 4130 standard.

REFERENCES:
patent: 3240639 (1966-03-01), Lihl
patent: 3840718 (1974-10-01), Myers
patent: 4154565 (1979-05-01), Hyde et al.
patent: 4950863 (1990-08-01), Gilliland
patent: 5062490 (1991-11-01), Rassieur
patent: 5368083 (1994-11-01), Beck, III

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