What characteristics are evaluated in the magnetic particle indicators after testing?

The evaluation of magnetic particle indicators after testing primarily focuses on their size, shape, color, and distribution. These characteristics are critical because they provide essential information about the presence and severity of any discontinuities or defects in the tested material.

Size refers to how large the particles are, which can impact visibility and effectiveness in drawing attention to flaws. The shape is important because specific shapes might react differently to magnetic fields, affecting how well they adhere to defects. Color can indicate the type of particles used (e.g., fluorescent vs. non-fluorescent), and this characteristic also influences the visibility under different lighting conditions. Finally, the distribution of the indicators across the surface of the test item can help assess the extent of any flaws; well-distributed particles suggest good coverage and indicate the surface state, while clumping or uneven distribution may point to localized issues.

In summary, assessing these specific characteristics of magnetic particle indicators plays a crucial role in interpreting the results of magnetic particle testing, thereby ensuring that potential defects are detected and properly evaluated.