4. cont casting, furnaces, deffects
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TRANSCRIPT
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Cont
inuo
us C
astin
g
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Various furnaces used in FOUNDRY PRACTICE
• Blast Furnace
• BOF
• Cupola
• Oxygen Lance Furnace
• Electric Arc Furnace
• Induction Furnace
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Crucible furnace
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Cupola
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Electric Arc Furnace
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Induction furnace
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Pouring vessel
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Casting defects
• Gas defects:Blow holes and open blows; air inclusions, pin hole porosity
• Shrinkage cavity:
• Mold material defect:Cuts and washes, metal penetration, fusion, run out, rat tails and bucklsswells, drop
• Pouring metal defects:Mis-runs, cold-shuts, slag inclusion
• Metallurgical defects:hot tears, hot spots
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Microporosity
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Surface defects
Internal defects Internal defects
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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
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