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AWS A4.2M_2006_(ISO 8249_2000_MOD)

AWS A4.2M:2006 (ISO 8249:2000 MOD) STANDARD PROCEDURES FOR CALIBRATING MAGNETIC INSTRUMENTS TO MEASURE THE DELTA FERRITE CONTENT OF AUSTENITIC AND DUPLEX FERRITIC-AUSTENITIC STAINLESS STEEL WELD METAL

Calibration procedures are specified for a number of commercial instruments that can then provide reproducible measurements of the ferrite content of austenitic stainless steel weld metals. Certain of these instruments can be further calibrated for measurements of the ferrite content of duplex ferritic-austenitic stainless steel weld metals. Calibration with primary standards (nonmagnetic coating thickness standards from the U.S. National Institute of Standards and Technology) is the preferred method for appropriate instruments. Alternatively. these and other instruments can be calibrated with weld-metal-like secondary standards.  Reproducibility of measurement after calibration is specified. Problems associated with accurate determination of ferrite content are described.

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