Overview
EN ISO 15549:2019 - Non‑destructive testing - Eddy current testing - General principles (CEN adoption of ISO 15549:2019) defines the general principles and performance requirements for eddy current examination of products and materials. The standard ensures repeatable, verifiable eddy current testing (ECT) results and provides guidance for preparing application documents that specify method requirements for particular product types. It is a European endorsement of the ISO document and supersedes the earlier edition.
Key topics and technical requirements
- Fundamental principles: ECT is based on induction of alternating currents in conducting materials; measured responses are represented as vectors in the complex plane. Eddy current density decays exponentially with depth for a given frequency.
- Factors affecting results: electrical conductivity, magnetic permeability, product geometry/size, and probe-to-product relationship.
- Examination modes: static and dynamic inspections; manual or automated scanning.
- Equipment and probes: requirements for the examination system, instruments, probes and reference test pieces (referenced in ISO 15548‑1 and ISO 15548‑2).
- Preparation and verification:
- instrument and probe settings, surface preparation and product identification
- verification intervals, functional and preventive verification procedures to ensure consistent performance
- Personnel: operators and examiners must be certified in accordance with ISO 9712 (or equivalent).
- Examination practice:
- defined steps for examination, coverage requirements, signal characterization and acceptance criteria
- documentation requirements covering procedures and examination reports to support traceability and repeatability
- Non‑contact advantages: no coupling medium required, high throughput capability for production environments.
Practical applications
EN ISO 15549:2019 applies where eddy current testing is used to detect discontinuities, measure coating thickness, assess geometric or metallurgical properties, or sort materials by conductivity/permeability. Typical applications include:
- Rolling mills, drawing and finishing lines (on‑line inspection)
- Heat‑exchanger tubing in service inspections
- Quality verification of mass‑produced articles and semi‑finished goods
- Maintenance inspections in aerospace and automotive industries
- Inspection of cylindrical holes, tubes, bars, profiles and forged or cast components
Who should use this standard
- NDT engineers and technicians performing eddy current tests
- Quality managers and inspection planners in manufacturing, oil & gas, power generation, aerospace and automotive sectors
- Suppliers of ECT equipment and probe manufacturers preparing application documents or verification protocols
Related standards
Keywords: EN ISO 15549:2019, eddy current testing, non‑destructive testing, NDT, equipment verification, probe calibration, personnel certification.
