The purpose of this is to feed the molten metal to the mold cavity as the molten metal solidifies and shrinks, and thereby prevents voids in the main casting.
其目的是当熔化金属凝固和收缩时往型腔里补充熔化金属，从而防止在主铸件中产生孔隙。
What inspection functions are performed for the detection of casting cracks, porosity, and shrinks?
如何检验铸件的裂纹，缩孔，缩松？
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