Eddy-Current Testing

Use Cases:

ET has been integrated across a wide range of field and lab-based inspections for:

• Bridge fabrication and retrofit projects
• Rail and transit infrastructure (fastener areas, rail heads, conductive welds)
• Airport terminals and hangar repairs
• Heat exchanger tubing in power plants, chemical processing units, and HVAC
• Structural weld inspections for fatigue and crack-depth monitoring
• Post-weld QA of stainless steel, aluminum, and non-ferrous alloys
  

Applicable Infrastructure Testing Examples:

• Rail: Head checks, shelling, fastener hole cracks
• Power: Condenser tube corrosion and wall thinning
• Bridges: Retrofit weld checks in aluminum/stainless applications
• Transit: Train axle and wheel seat inspections
• Energy: Overlay and clad thickness verification
• Marine and Ports: Corrosion and flaw detection under coatings

Key Benefits:

• Surface and sub-surface defect detection in both ferromagnetic and non-ferromagnetic materials
• No need to remove paint or coatings in many applications
• Capable of identifying small cracks (< 0.2 mm / ~0.008″) and microstructural changes
• No coupling media required (dry test)
• Effective even in low-temperature outdoor conditions, unlike PT
• Ideal for automated or high-speed scanning
• Excellent data logging, traceability, and documentation

ASME (American Society of Mechanical Engineers):

• ASME Section V (Nondestructive Examination)

ASTM International:

• ASTM E215, E243, E268, E309, E376, E426, E566, E570, E571
• ASTM E690, E703, E1004, E1033, E1312, E1571, E1606
• ASTM E1629, E2096, E2337

ISO (International Organization for Standardization):

• ISO 9712 – Qualification of NDT personnel
• ISO 135 – Eddy current testing basics
• ISO 17643 – Weld ET
• ISO 12718, ISO 15549