Rotary rock bit bearing pin hardfacing method and apparatus

摘要

A rotary rock bit bearing is produced by filling a groove in the bearing pin of the bit with a hardfacing material. A crucible is positioned around the bearing pin. Hardfacing material is positioned in the crucible. A heating means for heating said crucible is positioned around the crucible and energized. A temperature sensitive primary control means for controlling said heating means is operatively connected to said crucible. A temperature sensitive secondary control means for controlling said heating means is operatively connected to the bearing pin ball bearing raceway flange. The primary control means is operative during the first portion of the hardfacing operation and the secondary control means is operative during the second portion of the hardfacing operation.