Too much air trapped (sucked in) by the initial parts of the gating system often results in major gas porosity defects and the appearance of so-called bifilms that typically scrape the casting. It is very often caused by a poorly designed gating system, mainly the pouring basin (a cup) and the down sprue (sprue), which together create the inlet for the liquid alloy going into and then through the casting mold. One of the key factors that affect the internal quality of the casting is the gas (mainly air) during the pouring of the mold. This is true for every foundry technology and every type of casting mold used. There is no doubt that the quality of castings is highly dependent on the gating system.
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