Atlas of Casting Defects
Negative
Incomplete casting with rounded edges where casting is not completely formed
N/A
Thin sections and sharp edges away from the gate
Misrun
Visual Inspection
During casting, the metal freezes before mold cavity is completely filled out
| Area | Possible Cause | Potential Correction |
|---|---|---|
| Shell | Low mold permeability |
Consider reducing shell thickness. Vent thin sections |
| Foundry | Low metal pouring temperature |
Increase metal temperature, improve ladle preheating, speed time from tap to pour |
| Foundry | Low mold temperature |
Speed time from oven to cast or insulate mold to prevent heat loss |
| Foundry | Interrupted pour |
Pour without interruption |
| Foundry | Lack of metal fluidity |
Increase fluidity by reducing metal oxides or adjustment of the metal chemistry |
| Foundry | Poor gating system |
Modify gating design to create more entry points for alloy |