Seal coating interior of tubing

Claim 1

THE METHOD OF COATING THE INTERIOR OF STEEL TUBING WITH A CORROSION-RESISTANT COATING DURING THE FORMATION OF SAID TUBING FROM SUBSTANTIALLY FLAT STEEL STRIP BY A CONTINUOUS PROCESS OF BENDING AND WELDING AND WHILE SAID TUBING IS BEING MOVED CONTINUOUSLY AND LONGITUDINALLY, SAID METHOD COMPRISING THE STEPS OF, INTRODUCING INTO THE TUBE DURING THE MOVEMENT THEREOF AND AT A POINT WHERE THE TUBE IS FULLY FORMED, A DISPERSING LIQUID CONTAINING FINELY DIVIDED PARTICLES OF A NON-FERROUS METAL HAVING A MELTING POINT LOWER THAN THAT OF STEEL, COOLING THE TUBING ADJACENT THE POINT OF INTRODUCTION OF SAID LIQUID THEREINTO IN ORDER TO MAINTAIN A TEMPERATURE AT SUCH POINT WHICH IS INSUFFICIENT TO VOLATILIZE THE LIQUID, INTRODUCING A REDUCING GAS INTO THE TUBE ADJACENT THE POINT OF INTRODUCTION OF THE DISPERSING LIQUID SO AS TO MAINTAIN A NONOXIDIZING ATMOSPHERE THEREIN, SUBSEQUENTLY HEATING THE TUBE DURING ITS CONTINUED MOVEMENT TO A DEGREE SUFFICIENT TO VOLATILIZE ALL OF THE DISPERSING LIQUID BUT BELOW THE MELTING POINT OF THE COATING METAL, THEREAFTER HEATING THE TUBING DURING FURTHER MOVEMENT THEREOF TO A DEGREE SUFFICIENT TO MELT SAID COATING METAL AND CAUSE IT TO FLOW INTO THE PORES OF THE STEEL SO AS TO FORM A CONTINUOUS NON-CORROSIVE COATING ON THE STEEL, AND FINALLY COOLING THE TUBING SUFFICIENTLY TO CAUSE THE COATING METAL TO SOLIDIFY.

Claim 2

THE METHOD OF COATING THE INTERIOR OF STEEL TUBING WITH A CORROSION-RESISTANT COATING DURING THE FORMATION OF SAID TUBING FROM SUBSTANTIALLY FLAT STEEL STRIP BY A CONTINUOUS PROCESS OF BENDING AND WELDING AND WHILE SAID TUBING IS BEING MOVED CONTINUOUSLY AND LONGITUDINALLY, SAID METHOD COMPRISING THE STEPS OF, INTRODUCING INTO THE TUBE DURING THE MOVEMENT THEREOF AND AT A POINT WHERE THE TUBE IS FULLY FORMED, A DISPERSING LIQUID CONTAINING FINELY DIVIDED PARTICLES OF A NON-FERROUS METAL HAVING A MELTING POINT LOWER THAN THAT OF STEEL, COOLING THE TUBING ADJACENT THE POINT OF INTRODUCTION OF SAID LIQUID THEREINTO IN ORDER TO MAINTAIN A TEMPERATURE AT SUCH POINT WHICH IS INSUFFICIENT TO VOLATILIZE THE LIQUID, INTRODUCING A REDUCING GAS INTO THE TUBE ADJACENT THE POINT OF INTRODUCTION OF THE DISPERSING LIQUID SO AS TO MAINTAIN A NONOXIDIZING ATMOSPHERE THEREIN, SUBSEQUENTLY HEATING THE TUBE DURING ITS CONTINUED MOVEMENT TO A DEGREE SUFFICIENT TO VOLATILIZE ALL OF THE DISPERSING LIQUID BUT BELOW THE MELTING POINT OF THE COATING METAL, THEREAFTER HEATING THE TUBING DURING FURTHER MOVEMENT THEREOF TO A DEGREE SUFFICIENT TO MELT SAID COATING METAL AND CAUSE IT TO FLOW INTO THE PORES OF THE STEEL SO AS TO FORM A CONTINUOUS NON-CORROSIVE COATING ON THE STEEL, AND FINALLY COOLING THE TUBING SUFFICIENTLY TO CAUSE THE COATING METAL TO SOLIDIFY.