erosion scab

erosion scab

[ə′rō·zhən ‚skab]
(metallurgy)
A defect in the form of a solid mass of sand and metal that occurs when molten metal has been agitated or boiled or has partially eroded in the sand of a metal-casting mold.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Without sufficient hot strength, high metal velocity washes the mold material away, leaving an erosion scab.
Defect Detective: Common Green Sand Flaws: Green sand quality control, including good critical visual inspection, helps avoid scrapped castings
Without sufficient hot strength, high metal velocity washes the mold material away, leaving an erosion scab. The loosened sand may be found as inclusions in other parts of the casting.
It's Time to Play, Name ... That ... Green Sand Casting Defect!
Depending on a foundry's ability to control sand temperature, casting results can range from high scrap (sand inclusions, washes or erosion scabs, surface roughness, pinholes, crushes and broken molds) to complete loss of system control.
Foundry sand testing focus of molding division
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