Patent ID: 8921745

Claim:
An impeder for controlling a magnetic field path in a workpiece in an electric induction welding process, the impeder comprising: a magnetic material having at least one entry passage and at least one exit passage formed centrally therethrough for an entry flow of a cooling medium at the at least one entry passage and an exit flow of the cooling medium at the at least one exit passage, the at least one entry passage disposed at a first end of the magnetic material and the at least one exit passage disposed at a second end of the magnetic material, the second end of the magnetic material opposite the first end of the magnetic material; and a high temperature enclosure surrounding the magnetic material, the high temperature enclosure having at least one inlet port connected to the at least one entry passage for injecting the cooling medium into the at least one entry passage and at least one outlet port connected to the at least one exit passage for discharging the cooling medium from the at least one exit passage, the at least one inlet port and the at least one outlet port axially aligned with the at at least one entry and exit passages formed centrally through the magnetic material.