Eddy Current Inspection for Ferritic Welds

Eddy current inspection is a well-established NDT technique, but inspecting ferritic steel welds presents particular challenges. Changes in material properties around the heat affected zone can produce signals that are significantly larger than those generated by cracks, making reliable surface crack detection more difficult. Advances in probe design and modern eddy current equipment have helped overcome many of these challenges, making the technique increasingly applicable to the in-service inspection of ferritic steel structures and welded components.

TWI Training's Eddy Current Inspection of Ferritic Welds course is designed for NDT operatives, inspectors and technicians involved in the application of eddy current techniques, as well as those responsible for developing inspection techniques and instructions for ferritic welds.

Applying Eddy Current Inspection to Ferritic Welds

One of the important considerations when applying eddy current inspection to ferritic welds is the range of variables that can affect the examination. The course looks at factors including suitable eddy current probes and coils, material properties, protective coatings and weld geometry. Understanding these variables is essential when determining whether eddy current inspection is appropriate and defining the limitations of an examination.

A particular advantage of the technique is that, under quantifiable conditions, inspections can be carried out through corrosion protection systems. This can potentially avoid the costly removal and subsequent replacement of protective coatings when inspecting coated welds.

The course goes beyond the principles of eddy current testing, helping candidates understand how to evaluate the variables involved and establish the limitations of an inspection. Candidates also develop the ability to write clear and concise inspection instructions and test reports — important skills when applying NDT techniques within an in-service inspection environment.

The training is delivered in accordance with the requirements of BS EN ISO 9712 and covers the syllabus requirements for CSWIP/PCN Level 2. The course concludes with the relevant certification examination.

Upcoming Training Dates

The next Eddy Current Inspection of Ferritic Welds course takes place in Middlesbrough from 12 October 2026, with places currently available.

For those unable to attend the October course, the next opportunity is 7 December 2026, also providing an opportunity to develop specialist knowledge in this area of NDT before the end of the year.

Whether you are involved in NDT inspection, in-service inspection or the development of eddy current inspection procedures, specialist training can help build the knowledge needed to apply the technique effectively to ferritic welds.

Explore the course and check availability for the upcoming Middlesbrough dates.