Thermoplastics provide several advantages over thermoset composites, including the potential for fastener-free assembly via induction welding. Key parameters in modeling this process include coil frequency, excitation current, and coil offset distance. However, optimizing heat generation through coil geometry remains underexplored. This study aims to derive relationships between coil geometry, heating rate, and frequency through an iterative coil design approach. Two coil design groups are devel