Explanation

The final solidification area of alloy materials is an open or closed cavity due to insufficient feeding. The shape is irregular, the hole wall is rough, and generally there is an oxide film. Therefore, welding cannot be performed during subsequent hot processing. The appearance of shrinkage hole is related to the liquid shrinkage, solidification shrinkage, solid shrinkage, crystallization temperature range, thermal conductivity, etc. of alloy, as well as process parameters such as casting temperature, casting speed, mold cooling capacity, cavity shape, etc. shrinkage hole is a serious casting defect, and the shrinkage hole inside the casting is very harmful. shrinkage hole should be avoided or shrinkage hole should be removed by cutting.

Classification