File:Foundry defect blowhole.jpg

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Description
English: A "blowhole" casting defect in a commercial steel lathe face plate. A bubble of air became mixed into the molten iron, then froze with the metal into the plate, and was only exposed while machining the bolt slots. This part is still usable, although overtightening a bolt over the hole could crush part of the plate.
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Author Orion Lawlor

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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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current23:19, 1 November 2009Thumbnail for version as of 23:19, 1 November 20093,072 × 2,304 (1.22 MB)Olawlor (talk | contribs){{Information |Description={{en|1=A "blowhole" casting defect in a commercial steel lathe face plate. A bubble of air became mixed into the molten iron, then froze with the metal into the plate, and was only exposed while machining the bolt slots. This

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