Process of applying hard surfacing material to metal bodies

Claim 1

THE PROCESS OF APPLYING HARD SURFACING MATERIAL TO THE TEETH OF A ROTARY METAL CUTTER FOR AN EARTH DRILLING BIT, WHICH COMPRISES COVERING THE TEETH WITH A PASTY SODIUM SILICATE SOLUTION, EMBEDDING HARD SURFACING MATERIAL IN A GRANULAR FORM UPON THE COVERED SURFACE, HEATING THE SODIUM SILICATE BY HEATING THE METAL OF THE CUTTER AND UTILIZING THE HEAT RADIATING FROM THE METAL OF THE CUTTER TO DRIVE SUBSTANTIALLY ALL OF THE LIQUID VEHICLE FROM THE SODIUM SILICATE, ROTATING THE CUTTER AND AXIALLY RECIPROCATING THE CUTTER WHILE PLAYING A FLAME UPON SAID TEETH, IMPINGING THE HEAT WAVES EMANATING FROM SAID CUTTER TEETH ONTO AN ELECTRIC HEAT RESPONSIVE ELEMENT THEREBY INDICATING AN ELECTRIC VOLTAGE PROPORTIONAL AND REPRESENTATIVE OF THE INTENSITY OF SAID HEAT WAVES, AND STOPPING THE HEATING OF THE CUTTER WHEN SAID ELECTRIC VOLTAGE ATTAINS A PREDETERMINED VALUE INDICATING THE TEMPERATURE OF THE SURFACE OF THE CUTTER TEETH, AT WHICH THE METAL OF THE SURFACE FORMS A BOND WITH THE HARD SURFACING MATERIAL.