Magnetic particle testing is a method used to detect surface and near-surface defects in ferromagnetic materials such as iron, carbon steel, low-alloy steels, PH steels, casting, nickel and cobalt. This technique identifies flaws by looking for flux leakage; magnetic particles accumulate at these regions, creating a visible build-up even in very narrow cracks.
One of the key advantages of magnetic particle testing is its portability. The equipment used is often lightweight and easy to transport, allowing for on-site, cost-effective inspections. This is particularly useful when dealing with large or heavy components where transportation is difficult.
Additionally, magnetic particle testing is an efficient and fast method – much quicker than other NDT methods – allowing for quick inspections of extensive areas or volumes of material. The immediate visibility of test results on the material’s surface makes it especially beneficial in time-sensitive industries such as manufacturing and maintenance.
As we have already mentioned, magnetic particle testing is a cost-effective inspection method not only because of its portability, but also because it does not require rigorous pre-cleaning or post-cleaning processes, aside from any debris.
Also, this method allows for the accurate detection of both minuscule and larger deformities in a single test process, reducing the overall cost and time involved in inspections.
Magnetic particle testing is renowned for its high sensitivity to surface and near-surface defects. This makes it an ideal method for detecting shallow and fine cracks, seams, laps and other flaws that might not be easily visible.
Just like other non-destructive methods, magnetic particle testing does not cause any damage to the material being inspected – a crucial advantage for maintaining the integrity of components.
The versatility of magnetic particle testing is another significant advantage. It can inspect parts with irregular shapes and surfaces, even ones that have other materials on them, such as external splines, crankshafts and connecting rods. It is also not limited by the size of the test object, making it suitable for a wide range of inspections.
The combination of all these advantages makes magnetic particle testing a preferred choice for many NDT applications. NECIT NDT Division own a suite of Non-Destructive Testing procedures covering numerous international standards such as ISO, ASME, DNV and UK Defence Standards.
