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EDDY CURRENT LEVEL II REFRESHER

Eddy current testing is a Nondestructive inspection technique that is based on the principles of electromagnetic induction. It is used in the inspection and identification of electrically conductive metals and metal parts.

This module is a Level II refresher course for eddy current testing. It will refresh your memory on the fundamentals, principles, and applications of eddy current testing.

Cost: $33.00 for a 3 month license

Click on a lesson name below to view the covered topics

Fundamentals of Eddy Current

  • Introduction
  • Primary Magnetic Field
  • Electromagnetic Induction
  • Intensity and Distribution
  • Depth of Penetration
  • Properties of Eddy Current
  • Advantages of Eddy Currents
  • Disadvantages of Eddy Currents

Material Properties Affecting Eddy Currents

  • Introduction
  • Electrical Conductivity
  • Factors Affecting Conductivity
  • Measurement of Conductivity
  • Effect of Conductivity on E/Cs
  • Magnetic Permeability
  • Part Geometry
  • Part Homogeneity

Inspection Conditions Influencing Eddy Currents

  • Introduction
  • Frequency
  • Magnetic Coupling
  • Lift-Off
  • Fill Factor
  • Coil Current
  • Temperature

Principles of Eddy Current Testing

  • Introduction
  • Impedance Testers
  • Resistance
  • Induction
  • Measurement of Inductance
  • Inductive Reactance and Phase Difference
  • Impedance Measurement

Principles of Eddy Current Testing (continued)

  • Detection Sequence
  • Phase Shift Measurement
  • Impedance Plane


Frequency Response

  • Introduction
  • Skin Effect
  • Effect of Frequency on Sensitivity
  • Effect of Frequency on Depth of Penetration
  • Determination of Depth of Penetration

Analysis of Eddy Current Signals

  • Introduction
  • Impedance Diagrams
  • Importance of Signal to Noise Ratio
  • Lift Off Compensation
  • Frequency Selection
  • Probe Selection
  • Elimination of Ambient Difficulties

Inspection Systems

  • Introduction
  • Types of Probes
  • Types of Coil Windings

Types of Eddy Current Testers

  • Introduction
  • Types of Eddy Current Testers
  • The Nortec 19eII
  • The FD-100
  • Cable Testers

Nortec 19eII Eddyscope Controls & Operation I

  • Introduction
  • 19eII Features
  • The 19eII Display
  • The 19eII Keypad

Nortec 19eII Eddyscope Controls & Operation II

  • Introduction
  • Gain
  • Frequency
  • Theta Angle
  • Filter
  • Probe Drive
  • Position
  • Null
  • Erase
  • Sample Test Setups
  • Surface Flaw Detection
  • Conductivity Measurements

Interpreting Indications

  • Introduction
  • Impedance Plane Display - Conductivity Curve
  • Surface Flaw Detection Curve
  • Bolt Hole Flaw Detection Curve
  • Thickness Measurement of Non-Conductive Coatings
  • Thickness Measurement of Non-Ferrous Metals
  • Conductivity Measurement
  • Second Layer Crack Detection

Eddy Current Standards

  • Introduction
  • General Definition
  • Purpose of Eddy Current Standards
  • Natural Crack Standards
  • A.F. General Purpose Eddy Current Standards
  • Conductivity Reference Standards

General Procedures, Maintenance and Safety Precautions

  • Introduction
  • General Procedures for Eddy Current Testing
  • Quality Control
  • Battery Charging
  • Maintenance
  • Cleaning
  • Safety