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Inspection of HDPE Pipe Thermal Butt-fusions using Microwaves

The objective of the volumetric inspection technique described in this paper is to determine the amount of recrystallization of the melt zone and therefore the strength of the joint. Full recrystallization of the melt zone for the fusion would result in full ductility of the melt zone. All errors or changes in crystallinity cause a localized change in the dielectric properties and permittivity of the material.

References
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