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

Microporosity

Surface defects

Internal defects Internal defects

Inspection Techniques of Castings• Visual Inspectionrough surface, obvious shifts, shift of core etc

• Pressure testmicro leak detection

• Magnetic Particle Inspectionsubsurface voids, cracks etc

• Dye-penetrant Inspectioninvisible surface defects in a non-magnetic casting

• Radiographic examinationvoids, non metallic-inclusions, hot tears, cracks, porosity

• Ultrasonic Inspection• SEM