Abstract
Finite element modelling of high frequency inductive coils and metal plates was used to investigate the impedance response to a narrow gap between the plates. The model was used to predict distance sensitivity for both coil-to-gap and coil-to-plate. Different coil axis orientations, along and across the gap and normal to the plate, were modeled, as well as different coil lengths. The model can be used to predict the working range and select orientation and geometry of inductive seam tracking probes with zero gap capability for precision laser beam welding. Different materials, thicknesses and frequencies can be used.
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