MAGNETIC STRIP CARD – FULL DESCRIPTION

A Magnetic Strip Card (also known as Flux Indicator Card or Magnetic Field Viewing Card) is a small, flexible card used to visually display the presence, strength, and direction of magnetic fields during Magnetic Particle Testing (MPI).

It helps inspectors verify magnetization, detect field leakage, and confirm proper field direction before applying magnetic particles.

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✔ Purpose of Magnetic Strip Card

A Magnetic Strip Card is used to:

• Check magnetic field strength

• Verify magnetic field direction

• Detect flux leakage on ferromagnetic surfaces

• Confirm proper magnetization during MPI

• Identify active field zones before inspection

• Determine suitability of yoke, coil, or bench machine magnetization

It is a fast alternative to Gauss meters for quick visual field checks.

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✔ Construction

A typical Magnetic Strip Card contains:

1. Flexible Plastic Card

   • Size similar to a credit card

   • Durable and pocket-friendly

2. Encapsulated Magnetic Particles

   • Fine ferromagnetic particles suspended within a transparent layer

   • Particles move in response to magnetic fields

3. Dark Background

   • Enhances visibility of particle movement

4. Markings/Scale (optional)

   • Indicates field direction

   • Helps determine approximate field strength

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✔ How It Works

• When placed near a magnetic field or magnetized part, the embedded particles align along the magnetic flux lines.

• This alignment becomes visually visible, showing lines or patterns.

• Stronger magnetic fields produce sharper and denser patterns.

It is particularly useful for:

• Checking yoke magnetization zones

• Identifying coil field direction

• Detecting magnetic leakage around welds

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✔ How to Use a Magnetic Strip Card (Step-by-Step)

1. Place the card on or near the test surface.

2. Activate the magnetic field (yoke, coil, prods, head shot).

3. Observe the pattern of particles forming on the card:
   ✔ Dense lines = Strong field
   ✔ Faint lines = Weak field
   ✔ Orientation of lines = Field direction

4. Adjust technique if required.

5. Remove card after field verification and continue MPI process.

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✔ Applications

• Magnetic Particle Inspection (MPI/MT)

• Testing yokes, coils, prods, and MPI bench machines

• Locating magnetic leakage zones

• Demonstrating magnetic flux lines for training

• Quick verification before formal Gauss Meter readings

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✔ Advantages

• Fast and easy to use

• No power supply required

• Inexpensive

• Portable and durable

• Ideal for field and shop use

• Good for training and demonstration

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✔ Limitations

• Not a calibrated instrument

• Cannot provide numeric Gauss values

• Patterns may be influenced by distance or angle

• Should be used only for qualitative field checks

For quantitative measurement, a Gauss Meter is required.

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If you want, I can also provide:

📌 ALT image description of Magnetic Strip Card
📌 Difference: Magnetic Strip Card vs Pie Gauge vs QQI Strip
📌 Short description (for catalog or brochure)

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