What is the primary purpose of eddy current testing?

The primary purpose of eddy current testing is to detect surface flaws in conductive materials. This non-destructive testing method utilizes electromagnetic induction to identify irregularities such as cracks, corrosion, and other surface anomalies. When an alternating current flows through a coil, it generates a changing magnetic field, which induces eddy currents in the material being tested. The characteristics of these eddy currents will change if there are flaws present, allowing technicians to assess the condition of the material effectively without causing any damage.

This method is particularly valuable for applications in aerospace, automotive, and manufacturing industries, where maintaining the integrity of components is critical. The other choices, while related to electrical properties, do not encompass the primary function of eddy current testing; therefore, they do not accurately represent its main utility in flaw detection.