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2. What characteristics in the radiograph below indicate that the voids were produced during a casting operation as opposed t
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Apart from exposure to hydrogen , as shown in figure these dark spots characterize the presence of non metallic inclusions like presence of sand inclusions , which occurs due to drop defect of casting . Also it may be dross presence which are non metallic oxides. They appears as irregular dark blotches in radiograph and the same can be seen in the above given picture.

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2. What characteristics in the radiograph below indicate that the voids were produced during a casting operation as opposed to resulting from exposure to hydrogen in service? 2. What charact...
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