What is the primary purpose of the Eddy Current Testing (ET) method?

The primary purpose of the Eddy Current Testing method is to detect surface and near-surface defects in conductive materials. This technique utilizes electromagnetic induction to generate eddy currents in the material being tested. When these currents flow, they create their own magnetic field, which can be influenced by any discontinuities, such as cracks or other defects, that may be present near the surface of the material.

By analyzing the characteristics of the eddy currents generated—such as their magnitude or phase—a technician can assess the integrity of the material. This non-destructive testing method is particularly effective for inspecting objects such as tubing or plates, where surface flaws could lead to significant failures. Therefore, the ability to identify these kinds of defects quickly and non-invasively is essential in many industries, including aerospace, automotive, and manufacturing.