CHAPTER 9

Defects and Inspection in Casting and Welding

DEFECTS IN CASTING
  • Defects in casting may arise due to faulty design of pattern, mould, core and gating system and due to defects in pouring techniques. Important casting defects with possible reason of their occurrence are tabulated below:
    Casting Defects Remarks
    Blows These are in the form of big gas cavities formed near the casting surface due to pressure of the mould gases.
      Permeability of the moulding sand needs to be improved to eliminate or minimise this defect.
    Scar It is a variation of blow and usually occurs on the top flat surface of a casting.
    Blister It resembles scar but is covered by a thin layer of metal over its certain portion.
    Scab It occurs on the flat ...

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