Induction heating head

An induction heating head, having a first face disposed to be held near a workpiece to be heated, comprising:

• a conductive coil, wherein the conductive coil is comprised of copper and is wound in a stacked spiral pattern having two layers and at least two turns in each layer, wherein each layer is wound in a spiral pattern in a single plane;
• a housing, in which the conductive coil is disposed;
• a flux concentrator, disposed on a second face of the conductive coil opposite the first face and around a circumference of the conductive coil, whereby the flux concentrator concentrates flux toward the first face of the induction head, and wherein the conductive coil is held in a fixed position with respect to the flux concentrator;
• and
• a plurality of spacers mounted to the housing disposed to maintain a desired separation between the first face and the workpiece.

An induction heating system, comprising:

• a switched power source having a converter that provides a converter output of at least 1 KW at root mean square converter voltage;
• and
• an induction head, coupled to the power source to receive the converter output at the RMS converter voltage, wherein the induction head includes a housing, and within the housing, a conductive coil disposed to induce heat in a workpiece and wound to be tuned to the converter output,
• wherein the conductive coil is comprised of copper and is wound in a stacked spiral pattern having two layers and at least two turns in each layer, wherein each layer is wound in a spiral pattern in a single plane, and whereby the conductive coil receives the root mean square converter voltage without the root mean square converter voltage being transformed to a lower voltage,
• wherein the induction head further comprises a flux concentrator, disposed on a first face of the conductive coil and around a circumference of the conductive coil, whereby the flux concentrator concentrates flux toward a second face of the induction head opposite the first face, and wherein the conductive coil is held in a fixed position with respect to the flux concentrator.