T.O. 33B-1-13-103Figure 3-61. Magnetic Particle Indication of Flash Line Tear in aPartially Machined Automotive Spindle Forging.j. CastingDefects. Steel and iron castings are subject to a number of defects which magnetic particletesting can easily detect. Surface discontinuities are formed in castings due to stresses resulting fromcooling, and are often associated with changes in the cross section of the part. These may be hot tearsor they may be shrinkage cracks that occur as the metal cools down. Sand from the mold can betrapped by the hot metal and form sand inclusions on or near the surface of castings. Gray iron castingsmay be quite brittle, and can be cracked by rough handling. (See Figure 3-62.)Figure 3-62. Magnetic Particle Indications of Defects in Castings.
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