Non-Destructive Testing (NDT) Practice Test

What is the primary scanning pattern recommended when performing an eddy current scan?

1. Random patterns that cover the area

2. Spirals that focus on a central point

3. Back-and-forth motions with minimal overlap

4. Patterns providing complete coverage and detecting perpendicular flaws

The correct answer is: Patterns providing complete coverage and detecting perpendicular flaws

The primary scanning pattern recommended when performing an eddy current scan is one that provides complete coverage and is designed to detect perpendicular flaws. This approach is essential because eddy current testing relies on the generation of swirling currents within conductive materials, which can be affected by variations in the material's conductivity, permeability, and geometry. By using patterns that ensure comprehensive coverage, the operator can effectively identify flaws that might be oriented in different directions. Perpendicular flaws, which can pose significant structural risks, are particularly relevant because they can disrupt the flow of the eddy currents. The scanning pattern must be systematic and consistent to ensure that areas of interest are scrutinized thoroughly, reducing the likelihood of missing critical defects. Ultimately, a scanning strategy that prioritizes thoroughness and sensitivity to the types of flaws commonly encountered in materials being inspected will yield the most reliable and accurate results in eddy current testing.