What is the effect of the geometry of the part on magnetic particle inspection (MPI)?

The geometry of a part significantly influences the effectiveness of Magnetic Particle Inspection (MPI). Complex shapes, such as those with tight corners, curves, or varying cross-sections, can create difficulties in achieving uniform magnetization. This uneven distribution of the magnetic field can lead to areas that do not magnetize properly, making it challenging to detect any discontinuities effectively.

Additionally, when the magnetic flux lines encounter abrupt changes in geometry, such as edges and notches, they can become concentrated, potentially causing magnetic leakage fields that may obscure flaws. This means that while MPI can still detect flaws in these areas, the risk of missing critical defects increases. Proper inspection techniques and calibration are essential when dealing with parts that have intricate designs to ensure accurate results.

In contrast, simpler geometries often allow for more straightforward magnetization and particle coating, which can make inspections more uniform and effective. Therefore, the correct understanding of how part geometry affects the MPI process is crucial for ensuring high-quality results in non-destructive testing.