Which of the following are common applications for eddy current testing?

Eddy current testing (ECT) is a versatile non-destructive testing (NDT) method widely used in various applications due to its effectiveness in detecting flaws and assessing material properties.

One primary application is the measurement of electrical conductivity and permeability, which helps in determining material characteristics and identifying changes in material composition that could indicate issues such as corrosion or heat treatment effects.

Additionally, ECT is commonly employed for measuring the thickness of thin metal sections, cladding, or coatings. This is particularly crucial in industries where maintaining material integrity is essential, such as aerospace and automotive, where components are often subjected to conditions that can affect thickness and thus performance.

Detection of surface and subsurface discontinuities is another critical function of eddy current testing. The technique is sensitive to various types of defects, including cracks and voids, which can compromise the structural integrity of a component.

Given that all these applications are integral to the capabilities of eddy current testing, the correct answer encompasses all the options provided. This highlights the comprehensive nature of ECT in both quality assurance and material evaluation across multiple industries.