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This cavitymay have resultedfrom post - casting shrinkage
orderto preventshrinkage during casting
Feeders or risers supply extra metal as the casting solidifiesto preventshrinkage occuring inside the casting
which provides a source of hot metalto preventshrinkage in the casting
the internal core(passive) caused bythe constrained casting shrinkage
hydrogen gas ... thus helpingto preventshrinkage when the casting solidifies
while the sand because of the strong heat , gas pressure , precipitation of gas can not penetrate into the molten metalresultingin Casting Picecs Air shrinkage
the amorphous alloycausessolidification shrinkage after casting
to an under - pressure in those areas where feeding is neededleadsto an under - pressure in those areas where feeding is needed
cracks in the casting over the mould unless the casting is free to shrink away from its mouldcan createcracks in the casting over the mould unless the casting is free to shrink away from its mould
alsoinfluencesalso
material(passive) caused bymaterial
dimensional changescausesdimensional changes
to voids not typical incan leadto voids not typical in
a pressure drop and viscous flow of enriched liquid inside the mushy zonecausesa pressure drop and viscous flow of enriched liquid inside the mushy zone
A riser(passive) is setA riser