AWS A4.2M:2020
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The latest, up-to-date edition.
STANDARD PROCEDURES FOR CALIBRATING MAGNETIC INSTRUMENTS TO MEASURE THE DELTA FERRITE CONTENT OF AUSTENITIC AND DUPLEX FERRITIC-AUSTENITIC STAINLESS STEEL WELD METAL
27-02-2020
This standard specifies the method and apparatus for • the measurement of the delta ferrite content, expressed as Ferrite Number (FN), in largely austenitic and duplex ferriticaustenitic stainless steel1 weld metal through the attractive force between a weld metal sample and a standard permanent magnet; • the preparation and measurement of standard pads for shielded metal arc covered electrodes.
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