T.O. 33B-1-13-102Figure 3-59. Surface of a Steel Billet Showing a Lap.Figure 3-60. Cross-Section of a Forging Lap (Magnified 100X).h. Burning. Overheating of forgings, to the point of incipient melting, results in a condition whichrenders the forging unusable in most cases, and is referred to as burning. However, the real source ofthe damage is not oxidation, but the material becoming partially liquefied due to the heat at the grainboundaries. Burning is a serious defect but is not generally shown by magnetic particle testing.i. FlashLineTears. Cracks or tears along the flash line (see Glossary) of forgings are usually caused byimproper trimming of the flash. If shallow they may "clean up" during machining. Otherwise they areconsidered defects. Such cracks or tears can easily be found by magnetic particles. (See Figure 3-61.)
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