Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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Sand inclusions and dross are nonmetallic oxides, appearing on the<br />
radiograph as irregular, dark blotches. These come from disintegrated<br />
portions <strong>of</strong> mold or core walls and/or from oxides (formed in the melt) which<br />
have not been skimmed <strong>of</strong>f prior to introduction <strong>of</strong> the metal into the mold<br />
gates. Careful control <strong>of</strong> the melt, proper holding time in the ladle and<br />
skimming <strong>of</strong> the melt during pouring will minimize or obviate this source <strong>of</strong><br />
trouble.<br />
Charlie Chong/ Fion Zhang
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