SEALED BEARING TYPE ROTARY CONE ROCK DRILLING BIT HAVING DISH CLOSURE BODY WELDED THERETO IN AIR-TIGHT MANNER AND WELDING METHOD

摘要

This invention relates to a belleville seal for a sealed bearing rotary cone rock bit. The inner static ring portion of the annular belleville seal is metal and is interference fitted over the base of a journal bearing. The separation joint formed between the inner diameter of the static ring portion of the belleville seal and the outside diameter of the journal bearing is circumferentially welded using a high-energy beam source to form a hermetically sealed metallurgical bond therebetween.