FERRITE TESTING (FT)

Ferrite is a crystal structure type that gives iron its magnetic properties. The ferrite test establishes the predominance of this structure in a metal. Typically the quality of a stainless steel weld is determined with a ferrite test showing a Ferrite Number ranging from 3 to 10.

Advantages

The test requires only a light contact which leaves no mark.
Ferrite values are determined directly and quickly.

Limitations

Some welds, depending on their heat treatment, may not respond to the Ferrite probe. In this case, Ferrite value must be calculated from OES, or Spark test results.