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hat is Electromagnetic Testing (ET) ?

Electromagnetic Testing (ET) is a nondestructive testing technique that relies on the principles of electromagnetic induction to identify flaws and evaluate material properties in industrial components. By inducing electric currents or magnetic fields within a material and observing the response, ET reveals valuable insights about the part’s internal condition without causing any damage.

This method is highly adaptable and can be applied using different techniques, making it suitable for a wide range of environments and industries.

A qualified NDT technician uses both experience and expertise to select the appropriate testing method, interpreting results and communicating them clearly through standardized reports.

Main Purposes of Electromagnetic Testing

• Detecting Surface and Subsurface Flaws
  ET can uncover surface-level and shallow internal defects such as cracks, voids, pits, and seams by monitoring variations in electromagnetic signals.
• Analyzing Material Properties
  The technique assesses features like electrical conductivity, magnetic permeability, alloy composition, and heat treatment effects, which are important for ensuring product quality.
• Measuring Coating Thickness
  ET can also determine the thickness of non-conductive layers applied over conductive materials—important for protective coatings and insulation.

Advantages and Limitations of Electromagnetic Testing in NDT

Electromagnetic Testing (ET) is a flexible inspection method widely used across industries such as manufacturing, aerospace, oil and gas, and power generation. One of its key benefits is that it does not require direct contact with the test surface, making it ideal for inspecting components that are delicate, coated, or difficult to access. This non-contact nature, combined with its speed and sensitivity, makes ET a valuable tool for maintaining the reliability and safety of critical systems and structures.