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Magnetic Particle Testing (MT) is a non‑destructive testing (NDT) method used to detect surface and near‑surface defects in ferromagnetic materials. By magnetizing a component and applying fine magnetic particles, MT makes cracks, laps, seams, and other discontinuities clearly visible, allowing rapid and reliable inspection of critical components.
What is Magnetic Particle Testing (MT)?
Magnetic Particle Testing works by inducing a magnetic field in a ferromagnetic material such as carbon steel, low‑alloy steel, or nickel alloys.

When a surface or near‑surface flaw is present, it disrupts the magnetic field and creates a leakage field. Fine ferromagnetic particles—dry or suspended in liquid—are attracted to these leakage fields, forming clear, visible indications of defects.

Key Technical Features

Applicable only to ferromagnetic materials

Applicable only to ferromagnetic materials

Detects surface and near‑surface discontinuities

Detects surface and near‑surface discontinuities

Uses dry or wet magnetic particles (fluorescent or non‑fluorescent)

Uses dry or wet magnetic particles (fluorescent or non‑fluorescent)

Immediate visual indications of defects

Immediate visual indications of defects

Portable and field‑friendly inspection technique

Portable and field‑friendly inspection technique

What MT Detects

Magnetic Particle Testing is highly effective for detecting:

High Sensitivity to Surface Defects

High Sensitivity to Surface Defects

MT can detect very small surface and slightly subsurface flaws that may not be visible to the naked eye.

Fast & Cost‑Effective

Fast & Cost‑Effective

The method is quick to apply and economical, making it ideal for production and shutdown inspections.

Immediate Results

Immediate Results

Defect indications are visible instantly, allowing rapid evaluation and decision‑making.

Simple & Portable

Simple & Portable

MT equipment can be portable, enabling inspection in workshops, field locations, and at height.

Versatile for Complex Shapes

Versatile for Complex Shapes

Effective on components with irregular geometries such as fillet welds, nozzles, and cast parts.

Near‑surface discontinuities in castings and forgings

Near‑surface discontinuities in castings and forgings

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Key Benefits of Magnetic Particle Testing

High Sensitivity to Surface Defects

High Sensitivity to Surface Defects

MT can detect very small surface and slightly subsurface flaws that may not be visible to the naked eye.

Fast & Cost‑Effective

Fast & Cost‑Effective

The method is quick to apply and economical, making it ideal for production and shutdown inspections.

Immediate Results

Immediate Results

Defect indications are visible instantly, allowing rapid evaluation and decision‑making.

Simple & Portable

Simple & Portable

MT equipment can be portable, enabling inspection in workshops, field locations, and at height.

Versatile for Complex Shapes

Versatile for Complex Shapes

Effective on components with irregular geometries such as fillet welds, nozzles, and cast parts.

Industries Using MT
Oil & Gas
Petrochemical & Refineries
Power Generation
Construction & Structural Steel
Automotive & Manufacturing
Aerospace & Defense

Common Inspection Tasks

Weld inspection (butt and fillet welds)

Weld inspection (butt and fillet welds)

Casting and forging examination

Casting and forging examination

Structural steel inspection

Structural steel inspection

Pipeline components and fittings

Pipeline components and fittings

Shafts, axles, gears, and fasteners

Shafts, axles, gears, and fasteners

How the Magnetic Particle Testing Process Works

Step 1: Surface Preparation

Step 1: Surface Preparation

Cleaning of the test surface to remove oil, grease, or debris.

Step 2: Magnetization

Step 2: Magnetization

The component is magnetized using yokes, prods, coils, or central conductors.

Step 3: Particle Application

Step 3: Particle Application

Magnetic particles are applied (dry or wet, fluorescent or visible).

Step 4: Inspection

Step 4: Inspection

Particle accumulation at leakage fields reveals defect locations.

Step 5: Evaluation & Reporting

Step 5: Evaluation & Reporting

Indications are assessed, documented, and reported.

Why Choose Our Magnetic Particle Testing Services

Certified MT inspectors (ASNT / ISO compliant)

Certified MT inspectors (ASNT / ISO compliant)

Wet, dry, fluorescent, and non‑fluorescent MT capability

Wet, dry, fluorescent, and non‑fluorescent MT capability

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Portable equipment for field and rope‑access inspections

Portable equipment for field and rope‑access inspections

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Fast reporting and reliable defect interpretation

Fast reporting and reliable defect interpretation

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Suitable for fabrication and in‑service inspection programs

Suitable for fabrication and in‑service inspection programs

Contact us at nisalesteam@setsco.com to discuss your project requirements.