3. deffect inspection

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3. deffect inspection

  1. 1. Casting defects • Gas defects: Blow holes, pin hole porosity • Shrinkage cavity: • Mold material defect: Cuts and washes, scab, metal penetration, fusion, run out, rat tails and buckles, swells, drop • Pouring metal defects: Mis-runs, cold-shuts, slag inclusion • Metallurgical defects: microporosity
  2. 2. Microporosity
  3. 3. Surface defects Internal defects Internal defects
  4. 4. Inspection Techniques of Castings • Visual Inspection rough surface, obvious shifts, shift of core etc • Pressure test micro leak detection • Magnetic Particle Inspection subsurface voids, cracks etc • Dye-penetrant Inspection invisible surface defects in a non-magnetic casting • Radiographic examination voids, non metallic-inclusions, hot tears, cracks, porosity • Ultrasonic Inspection • SEM

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