Which two parameters are key in selecting a non-destructive testing (NDT) method?

Choosing the appropriate non-destructive testing (NDT) method is crucial for ensuring the effectiveness and efficiency of inspections. The two parameters that are essential in this selection process are material properties and the type of defect expected.

Material properties play a significant role because different NDT methods can have varying effectiveness depending on the characteristics of the material being inspected. For instance, the method chosen for examining metals may differ from that used for composites or ceramics due to differences in density, thickness, and surface finish, among other factors.

Additionally, understanding the types of defects that are likely to occur—such as cracks, porosity, corrosion, or inclusions—is vital because it helps in selecting the method that can reliably detect those specific issues. Different NDT techniques have distinct sensitivities to various types of flaws; for instance, radiography might be better suited for volumetric defects, while ultrasonics might be preferred for detecting planar defects.

By focusing on material properties and expected defects, inspectors can ensure that the chosen NDT method is aligned with the specific needs and challenges of the inspection task, leading to more reliable and accurate results.