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Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A

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Sponge shrinkage shows itself as areas <strong>of</strong> lacy texture with diffuse outlines,<br />

generally toward the mid-thickness <strong>of</strong> heavier casting sections. Sponge<br />

shrinkage may be dendritic or filamentary shrinkage; filamentary sponge<br />

shrinkage appears more blurred because it is projected through the relatively<br />

thick coating between the discontinuities and the film surface.<br />

Charlie Chong/ Fion Zhang

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