Electro Spark Testing

Electro spark testing is most commonly used to detect voids where a coating fails to bond to the underlying material.  These voids, or holidays, often cannot be seen visually.  Technicians pass the electro spark tester along the surface, producing a series of electrical pulses.  If there is holiday, the pulse generates a spark at its precise location.  Electro spark testing is often used to inspect the interior of a vessel.

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