The magnitude of the indication caused by a discontinuity during an eddy current test on tubing depends on which of the following?

In eddy current testing, the magnitude of the indication caused by a discontinuity is influenced by several factors related to the characteristics of the discontinuity itself. Each of these factors plays a role in how the eddy currents behave when they encounter a discontinuity within the material.

The depth of the discontinuity affects how much of the eddy current is disrupted. Shallower defects might only slightly alter the path of the currents, while deeper defects can cause more significant disruptions, leading to stronger indications.

The width of the discontinuity is also crucial. A wider defect will interact with more of the eddy currents, resulting in a more pronounced change in the current flow and, consequently, a larger indication on the testing equipment.

Similarly, the length of the discontinuity affects how long the eddy current must travel through the disrupted area. A longer defect can create a more significant alteration in the eddy current pattern, which translates to higher signal amplitudes that are easier to detect.

Since all these dimensions—depth, width, and length—impact the interaction between the eddy currents and the discontinuity in the material, the overall magnitude of the indication during an eddy current test is dependent on all of the above attributes. This comprehensive understanding emphasizes the