Magnetic Particle Testing Services
At American Metal Testing, we provide magnetic particle inspection (MPI) services to industrial customers nationwide, including manufacturers throughout Indiana, Michigan, and the greater Chicago area. MPI, also known as magnetic particle testing (MPT), is a non-destructive testing method used to detect surface and subsurface discontinuities in ferromagnetic materials, including iron, nickel, cobalt, and their alloys. As a NADCAP-certified NDT provider, we use MPI to test components across a wide range of demanding industrial sectors, ensuring they meet strict performance standards.
You can visit our comprehensive MPI guide for more information on the process and its applications.
When to Use Magnetic Particle Inspection Services for Non-Destructive Testing
- Used only for ferromagnetic materials (non-ferrous materials like aluminum, magnesium, or certain stainless steels cannot be tested with MPI)
- An ideal NDT method for identifying surface and near-surface flaws like cracks, porosity, and inclusions
- A quicker examination method than most NDT processes, including FPI and RT
- Offers a cost-effective option compared to other NDT methods
- MPI has limitations in detecting subsurface discontinuities compared to other NDT methods
Magnetic Particle Testing Capabilities at AMT
Our MPI services can accommodate a wide range of part sizes and inspection requirements. Our team of NDT professionals will determine the best approach for each specific component. Our magnetic particle inspection capabilities include:
- Dry powder and wet fluorescent magnetic particle testing methods
- Can test parts and components up to 12 feet long
- Full magnetization capability for proper indication formation
- Certified NAS-410 inspectors review all results
Magnetic Particle Testing Procedure: Step-by-Step
Our MPI process includes five stages: pre-cleaning, magnetization, application of magnetic particles, inspection and interpretation, and post-cleaning.
- Pre-Cleaning: The material or component is cleaned and dried to remove any oil, grease, dirt, or other contaminants that may interfere with testing.
- Magnetization: A strong magnetic field is applied to the test material by passing an electric current through it or by placing a magnetic yoke on its surface.
- Application of Magnetic Particles: Magnetic particles, usually in the form of dry powder or wet suspension, are applied to the test surface while the magnetic field is still present. The particles are attracted to areas where a surface or near-surface defect distorts the magnetic field.
- Inspection & Interpretation: The surface is examined for particle accumulation. The particles form a visible indication at the location of any surface or near-surface defect.
- Post-Cleaning: After the inspection, the test material is cleaned to remove the magnetic particles, and demagnetized if required for its intended use.
Industries That Rely on AMT's Magnetic Particle Testing Services
We provide MPI services for industrial customers in a wide range of sectors, including aerospace, automotive, structural steel, and more. Our testing laboratory is accredited by the National Aerospace and Defense Contractors Accreditation Program (NADCAP), qualifying us to provide non-destructive testing services to leading aerospace manufacturers. Specific industrial applications for our magnetic particle testing services include:
- Welded components in all industries
- Aircraft equipment, including engine components and landing gear
- Automotive parts like axles, crankshafts, and gears
- Power generation equipment
MPI Testing Standards and Specifications at AMT
All testing is governed by the applicable standard specified for your part, including American Society for Testing and Materials (ASTM) International, Aerospace Material Specifications (AMS), American Society of Mechanical Engineers (ASME), Society of Automotive Engineers (SAE), American National Standards Institute (ANSI), American Welding Society (AWS), military (MIL) specifications, or applicable customer specifications.
In most cases, the design engineer determines which standard applies, since they know the part's intended use. That requirement is typically already documented on the drawing or purchase order by the time it reaches us.
Learn How AMT Can Provide Magnetic Particle Testing Services for Your Application
Contact American Metal Testing to discover how our MPI services can support your metal components. You can also request a quote for pricing information. We also offer additional non-destructive metal testing methods, including radiographic testing and fluorescent penetrant inspection services.
