Aluminum sheathed cable and method of making

Claim 1

A PROCESS FOR CONTINUOUSLY APPLYING ALUMINUM SHEATHING TO INSULATED POWER CABLE COMPRISING PROGRESSIVELY TRIMMING THE EDGES OF METAL STRIP MATERIAL, PROGRESSIVELY FORMING SAID STRIP INTO OPEN SEAM TUBING, SIMULTANEOUSLY WITH SAID STEP OF FORMING SAID STRIP INTO TUBING PROGRESSIVELY DISPOSING INSULATED POWER CABLE WITHIN SAID TUBING SUCH THAT THE PORTION OF SAID CABLE UNDERLYING THE OPEN SEAM IS SLIGHTLY SPACED THEREFROM, PASSING SAID CABLE AND CLOSELY SURROUNDING TUBING PROGRESSIVELY THROUGH A HIGH FREQUENCY ALTERNATING ELECTROMAGNETIC FIELD THEREBY INDUCING ALTERNATING CURRENT VOLTAGE WITHIN THAT PORTION OF SAID TUBING LOCATED WITHIN SAID ELECTROMAGNETIC FIELD, MAINTAINING THE OPPOSED SEAM EDGES OF SAID TUBING IN SPACED RELATION DURING SUBSTANTIALLY THE ENTIRE PATH OF TRAVEL THROUGH SAID ELECTROMAGNETIC FIELD, SAID SPACING BEING SUFFICIENT TO PREVENT ARCING ACROSS SAID EDGES, CAUSING SAID SPACED SEAM EDGES TO BE PROGRESSIVELY BROUGHT INTO CONTACT AT A POINT ADJACENT THE OUTER END OF SAID ELECTROMAGNETIC FIELD THEREBY RESULTING IN SUBSTANTIALLY ALL OF THE INDUCED ELECTRICCURRENT IN THAT SECTION OF THE TUBING WITHIN SAID ELECTROMAGNETIC FIELD TO CONCENTRATE AND FLOW ACROSS THE SEAM AT SAID POINT OF CONTACT BETWEEN SAID EDGES, THE HEAT PRODUCED BY SAID CONCENTRATED CURRENT FLOW FUSING SAID SEAM EDGES TOGETHER, AND THEREAFTER SUBJECTING PROGRESSIVELY EDGE FUSED PORTIONS OF SAID TUBING TO A RELATIVELY SMALL REDUCTION IN DIAMETER THEREBY CLOSELY CONFORMING SAID TUBING TO SAID INSULATED CABLE.