The importance of the electro-magnetic test methods used by FOERSTER was recognised as early as the thirties by the company founder, Friedrich Förster, and was corroborated scientifically and mathematically and incorporated time after time in industry-standard equipment in the fifties. The term "electromagnetic methods" covers the following areas: With the magneto-inductive method, it is possible to investigate the core and surface selectively by varying the frequency. Excitation is either with one single frequency or with several frequencies (serial or simultaneous), depending on the testing task. The hardened passenger-car crankshafts are supplied to the automatic tester after heat treatment. The MAGNATEST S detects inadmissible deviations from the required surface hardness by conducting a magneto inductive test. Magneto-inductive methods which cover the frequency band from a few Hz to approx. 1,000 Hz conventionally with absolute coils and which are generally used to determine integral, technological material properties, such as grain structure, hardness, case-hardening depth and layer thickness.

Areas of Expertise: Test Engineering (Non-destructive testing of finished products)