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.

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