Magnetic particle inspection (MPI)

Magnetic particle inspection (MPI) is a nondestructive testing (NDT) method that does not harm the inspected parts. MPI is a cost-effective and reliable testing method commonly used to identify surface and slightly subsurface discontinuities in ferromagnetic materials.

In this brochure we cover:

  • The Importance of Magnetic Particle Inspection
  • Determining Inspection Method
  • Determining Application Method
  • Common Applications
  • Common Terms
  • Method Process Guide

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14A magnetic powder is made with a carefully optimized range of particle shapes

14A magnetic powder is made with a carefully optimized range of particle shapes and sizes  that allow particles to move quickly and easily to indications without clumping. 14A is also designed with strong fluorescence to minimize background, which results in faster inspections with better reliability and greater confidence.

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5 minutes a week to stay ‘current’ Magnaflux

You can expect to stay up-to-date on the latest and greatest NDT knowledge and tips with our weekly blog article.

We will also occasionally send you new product and happenings information to keep you in the loop about what we are up to at Magnaflux.

Reading or skimming through our weekly emails and articles will only take you about 5 minutes each week (we know how busy you are!). Below are two of our most popular articles to get you started.

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How to Calibrate Your MPI Equipment in 5 Steps

In this article, we will go over the five key factors to successfully calibrate your Magnetic Particle Equipment in reference to ASTM E1444, ASTM E3024, ISO 9934, or Nadcap AC7114/2

by David Geis, Product Manager, and Brian Batteiger, NDT Services Manager

There are many different types of magnetic particle equipment, ranging from small portable power packs to wet bench units, all the way to high-amperage stationary power packs for large structures.

If you are following ASTM E1444, ASTM E3024, ISO 9934, or Nadcap AC7114/2, your equipment must be calibrated on a semi-annual basis. No matter what type of magnetic particle equipment you have, and no matter which specification you follow, the same five steps are used to perform equipment calibration.

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Y-2 AC Electromagnetic Yoke

The Y-2 is an AC electromagnetic yoke, ergonomically designed to improve productivity and reduce operator arm and wrist fatigue. The yoke generates a strong AC magnetic field for the detection of surface indications during magnetic particle testing.

Lightweight with an ergonomic grip and trigger, the Y-2 is designed for the rugged demands of field inspection. Featuring a field swappable cord and isolated trigger switch; the Y-2 is easily serviceable because a severed cord should not stop a job from getting done.

A super bright LED attachment is available as an optional item to help illuminate the inspection area while simultaneously magnetizing the part. All-in-one Kits are also available, including #1 Gray and #8A Red magnetic powders, a yellow paint marker, and cleaning cloth, for a full inspection kit in one convenient carrying case.

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How Low Temperatures Impact Dye Penetrant Testing

The operating temperature range for penetrant inspection as specified in ASTM E1417 Standard Practice for Liquid Penetrant Testing is 40°F to 125°F (4°C to 52°C), but how is the penetrant inspection affected at temperatures below 40°F (4°C) and can the inspection process be adjusted to achieve acceptable results?

To answer these questions, we evaluated SKC-S cleaner/removerSKL-SP2 solvent removable dye penetrant and SKD-S2 non-aqueous developer at a range of temperatures in order to figure out what NDT inspectors can expect when using these, or similar quality dye penetrant products when inspecting at lower temperatures

Cleaning at lower temperatures

At lower temperatures in the range of 32°F – 50°F (0°C – 10°C), the solvent cleaner will take longer to dry.

We used 75°F (24°C) as our ambient, standard operating temperature, and observed how decreasing temperatures impacted how quickly the solvent cleaner dried. Below are our suggested drying time for solvent-based cleaner/removers at lower temperatures.

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Up to 2x coverage compared to competitors

Up to 2x coverage compared to competitors

  • Can lasts longer, minimizing inspection costs
  • Reduce need for stocking and disposal cost

Reduce risk of missing indications

  • Reliable formula covers part surface evenly
  • Material stays on the part, ensuring proper inspections

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