AWS A4.2-97
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Standard Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferrite Content of Austenitic and Duplex Austenitic-Ferritic Stainless Steel Weld Metal
Calibration procedures include those for the Magne-Gauge, Ferritescope, and Inspector Gauge, using primary standards. Measuring ferrite content problems discussed in the appendix.
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