Patent ID: 9226341
Filing Date: 2015-12-29
Classification: C21D,C22F,C23C,H05B,Y10T

Abstract:
1. A method for forming an insulated conductor heater with a final cross-sectional area, comprising: placing an insulation layer over at least part of an elongated, cylindrical inner electrical conductor; placing an elongated, cylindrical outer electrical conductor over at least part of the insulation layer to form an insulated conductor assembly; performing at least one combination of a cold working step and a heat treating step on the insulated conductor assembly, wherein the at least one combination of the cold working step and the heat treating step comprises: forming the insulated conductor heater with a final cross-sectional area from the insulated conductor assembly by further reducing the cross-sectional area of the insulated conductor assembly after the at least one combination of the cold working step and the heat treating step is completed, wherein further reducing the cross-sectional area of the insulated conductor assembly comprises cold working the insulated conductor assembly to further reduce the cross-sectional area of the insulated conductor assembly by an additional amount ranging between about 5% and about 20% of the cross-sectional area of the insulated conductor assembly after the at least one combination of the cold working step and the heat treating step is completed.