Posted: May 22nd, 2023

A void is simply an enclosed air within an area of a mold

A void is simply an enclosed air within an area of a mold. There are several reasons “that might contribute to this including limited holding pressure, too fast a filling process, and it happens at thicker areas especially at the bosses and the ribs (Malloy 25)”. Moreover, they do also happen where there is un-melt embedded within a melt pool.

Finally, the blister is an imperfection defined by a raised part of a layered part on the surface of the mold (Fig. 4). This is caused by a process that the material is either too hot or there is a lack of a cooling unit.