MAGNETIC TESTING (MT) - Level 1 - ASNT

SCOPE

This course covers the principles of Magnetic Particle Testing and prepares a candidate to
• Select equipment to conduct test
• Setup test equipment
• Steps to conduct test
• Familiarize with codes and standards
• Interpret results with respect to applicable codes and standards
• Understand limitation of the test method
• Write test reports.

TRAINING

Training material is presented in modules that are followed by quizzes

MODULE 1: MANUFACTURING DISCONTINUITIES

• Types of Discontinuities: Inherent, Processing and Service
• Casting Discontinuities: Hot Tear, Cold Shut, Porosity, Shrinkage
• Primary Processing Discontinuities including discontinuities in Rolling, Forging, Drawing, Extruding
• Secondary Processing Discontinuities including discontinuities in Grinding, Heat Treating, Machining, Welding, Plating
• Service Discontinuities:- Erosion, Wear, Fatigue, Corrosion, Creep

MODULE 2: THEORY OF MAGNETISM

• Magnetic field, Lines of force, Flux density
• Permeability, Reluctance, Retentivity, Residual Magnetism and Coercive Force
• Diamagnetic, Paramagnetic and Ferromagnetic materials
• Leakage flux
• Fleming’s Right Hand and Left Hand Rule
• Magnetic Fields: Circular, Longitudinal
• Hysteresis Curve

MODULE 3: METHODS OF MAGNETIZATION

• Faraday’s Law: Electromagnetism
• Types of current AC, DC, HWDC
• Circular field: Head Shot (Direct Contact), Prods and Central Conductor Techniques, Offset Central Conductor
• Advantages and disadvantages of circular field
• Longitudinal field: Coils and Yoke
• Advantages and disadvantages of Longitudinal Field
• AC and DC Field Distribution in a Magnetic and a Nonmagnetic Conductor
• Demagnetization

MODULE 4: EQUIPMENT

• Equipment consideration
• Wet Horizontal, Mobile and Portable Equipments
• Fluorescent testing, Black Light
• Light meter
• Accessories

MODULE 5: MEDIUMS AND THEIR PREPARATION

• Dry and Wet method
• Particles: Dry and Wet
• Properties of particles
• Visibility of particles
• Methods of Application
• Contamination of Magnetic Particles
• Settling Test Procedure
• Concentration for Wet suspensions as per ASME Sec V Article 7
• Bath Maintenance

MODLULE 6: APPLICATIONS

• Residual and Continuous Method
• Magnetic Particle Inspection of Solid Cylindrical Parts, Gears, Multiple diameter Articles, Discs, Hollow Cylindrical Articles
• Selection of proper method of magnetization
• Verification of magnetic fields
• Checking the adequacy of field using the Pie gauge, shims

• Visual Inspection

• Minimum light intensity and light meter

• Magnetic Rubber Inspection

MODULE 7: TYPES OF INDICATIONS

• Interpretation including Relevant, False, Non-relevant indications

PRACTICAL TRAINING

EXAMINATIONS