Defects In Casting - Casting Defects - Time Zero

Casting Defects:

Blow Hole: The air or gas bubble present inside the casting is called blowhole.

It is because of low porosity property of molding sand, allow the partial flow of molten metal in the gating system, aspiration effect allowed in the gating system.

Porosity: The air or gas particle provide inside the casting is called porosity.

Scar: Air or gas bubble present on the surface of the casting is called scar.

Blister: Air or gas bubble present near the surface of the casting is called blister. The presence of blister in the casting will not cause to results in the casting, because it is removed during the machining process.

Dross: Impurities of foreign particle present inside the casting is called doss. It is because of improper separation of impurities present in the molten metal. It can be separated by using the Pouring Basin, Strainer, Skin Bob, etc.

Miss Run: Non-feeling of the projected portion of the cavity using molten metal produce a defect called as miss run defect. This defect is due to solidification of molten metal taking place before complete filling of the cavity. It can be eliminated either by reducing pouring time or by increasing the temperature of the molten metal.

Shrinkage Cavity: Open space produce in the casting due to non-availability of molten metal for compensating liquid shrinkage taking place during solidification.

Rat Tail Defects: The tail-like element produced on the surface of casting is called rat-tail defects. This is mainly produced when the wax pattern is used with green sand mold.

Sand Was: Sand inclusion present inside the casting is called sand wash defect. Is mainly due to the sand erosion take place during pouring of molten metal.

Shift Defect: The mismatch present between the cavity of open drag produces a step in casting process called a shift defect.

Cold Shut: The discontinuity produced due to contraction of gating junction is called as cold shut defect. This mainly produced in the step gating system with an insufficient degree of super-heat.

Metal penetration: This defect is caused due to the large grain size of sand, the molten metal fuses into the sand and solidifies which gives the rough surface of the casting.

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