Surface quality of parts is vital to the appearance and often the performance of components, which is why it is important to avoid pitting in castings. Pitting is a commonly occurring problem that can be avoided through careful process management. Contamination in a mold can result in indentations or pits on the surface of the casting. It can also happen when a sprue is poorly designed and allows trapped air bubbles to pit the part’s surface. Such bubbles can also result from overheated alloys, which may create gas in the mold. An under-heated mold can have remanent wax bits from the pattern when it is melted away. An expert foundry staff can avoid these and other pitting issues.
