Casting defect
![Blowhole defect in a cast iron part.](/Images/godic/202501/27/Foundry_defect_blowhole3545.jpg")
A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: gas porosity, shrinkage defects, mold material defects, pouring metal defects, and metallurgical defects.