Eddy Current Testing (ET)

Fast, non-contact inspection of conductive materials for surface and subsurface defects

INTRODUCTION

Eddy Current Testing (ET) is a non-destructive inspection method that uses electromagnetic induction to detect surface and near-surface defects in conductive materials. It’s ideal for identifying cracks, corrosion, and variations in material thickness without the need for direct contact or couplants.

This versatile method is widely used in industries such as aerospace, power generation, and manufacturing — providing precise, real-time results while maintaining component integrity.

How Eddy Current Testing (ET) Works? |

Eddy Current Testing works by passing an alternating current through a coil, creating a changing magnetic field. When the coil is placed near a conductive surface, eddy currents are induced in the material. Any discontinuity (such as a crack or corrosion) disturbs these currents, causing measurable changes in the coil’s impedance — which are displayed as signals for interpretation by the inspector.

Applications of Eddy Current Testing (ET)

Eddy Current Testing is highly adaptable and effective across industries that rely on conductive materials.
It’s used for both surface and near-surface flaw detection, as well as material characterisation and corrosion assessment. The technique offers rapid, contact-free inspections, making it ideal for areas that are difficult to access or require high precision.

Typical Applications Include:

Aircraft components (wings, fuselage, fastener holes).

Heat exchanger tubes and condensers.

Stainless steel and aluminium structures.

Weld inspection in pipelines and pressure vessels.

Advantages of ET

Eddy Current Testing (ET) offers a range of benefits that make it a preferred method for inspecting conductive materials. It provides rapid, accurate, and repeatable results without requiring surface preparation or contact fluids. The technique is highly effective for detecting cracks, corrosion, and material thinning — especially in areas where other methods may be difficult to apply. Its versatility, portability, and ability to deliver immediate results make ET ideal for both on-site and in-service inspections across multiple industries.

Detects both surface and near-surface defects.
Quick, accurate, and cost-effective inspection.
Ideal for complex shapes and curved surfaces.
Provides real-time data and instant results.
Portable — can be performed on-site or in workshops.
No need for couplants or surface coatings removal.

Types of ET Methods We Use

At Lateral Wave Pty Ltd, we employ both absolute and differential eddy current methods to provide accurate, reliable, and efficient defect detection across various applications.

Absolute Eddy Current Method

Provides direct measurement of conductivity and defect size in non-ferromagnetic materials.

This method uses a single coil to detect surface-breaking and subsurface flaws, measure coating thickness, and assess material properties. It’s highly sensitive and suitable for rapid field inspections or manufacturing quality control.

Differential Eddy Current Method

Ideal for detecting small flaws and variations between two points on a component.

Using a dual-coil probe, this technique compares signals from adjacent areas, effectively cancelling out noise and enhancing flaw detection accuracy. It is especially useful for detecting cracks, corrosion, and material inconsistencies in aircraft and industrial components.

Why Choose Lateral Wave Pty Ltd for ET?

Certified, precise, and efficient eddy current inspections

Request an Inspection

Ensure the quality and reliability of your assets with Eddy Current Testing (ET) by Lateral Wave Pty Ltd. Contact our expert team today to schedule your inspection or request a quote.

Call us at (04) 2030 3358 or email info@lateralwave.com.au to schedule your inspection or request a detailed quote.