Magnetic Particle Testing
Magnetic particle inspection (MPI) is a non destructive testing method used for defect detection in magnetic materials. MPI is fast and relatively easy to apply, and part surface preparation is not as critical as it is for some other NDT methods. These characteristics make MPI one of the most widely utilized non destructive testing methods.
Magnetic particle Inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and slightly subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys.
The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source.
The magnetic lines of force are perpendicular to the direction of the electric current, which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).
Application
- Weld inspection – Structural / Piping
- Casting / Forgings / Valves
Advantages
- Can detect both surface and near-surface indications.
- Surface preparation is not as critical compared to other NDE methods. Most surface contaminants will not hinder detection of a discontinuity.
- A relatively fast method of examination.
- Indications are visible directly on the surface.
- Low-cost compared to many other NDE methods.
- A portable NDE method, especially when used with battery-powered yoke equipment.
- Easy to use and requires minimal amount of training.
Limitations
- Non-ferrous materials, such as aluminum, magnesium, or
most
stainless steels, cannot be inspected.
Limited subsurface discontinuity detection capabilities. - Each part needs to be examined in two different directions.
- Only small sections or small parts can be examined at one time.
Inspection Equipment
- Parker MT AC & DC yoke
- Magnaflux MT AC & DC yoke
- FLUROSCENT MPI facilities avaliable
- Prod MPI facilities avaliable
Company's Credentials / Approvals / Accreditation
ISO/IEC – 17020
Saudi Aramco Approved
PERSONNEL QUALIFICATIONS: PCN, ISO 9712, ASNT Level 2/3
Experienced MT inspector for carry out difficult configuration of welds.
Experienced in house ASNT NDT Level III and experts for providing techniques establishment, procedure preparation, approval and consultancy services
ASNT NDT Level III trainers for conducting in house or external NDT Level 2 training and certification courses on Ultrasonic testing and other NDT inspection methods. Read more about Ultrasonic Testing Personnel Certifications.
MT inspectors qualified and certified to Level II as per ASNT recommended practice SNT-TC-1A is approved & also BINDT (British institute of nondestructive testing) approved Level-II according to ISO 9712:2012 for carry out inspection.