Less than one degree Celsius of warming since the pre-industrial age has unleashed frightening and unforeseen change, including glacier-melt and unprecedented coral-reef degradation.
The essential procedures consist of alloy melting, preheating pre crystalizer, melt stirring and oscillation, solidification and drawing.
其基本过程包括合金熔炼、预结晶器预热、熔体搅拌和振动、凝固拉坯等基本环节。
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For shrinkage and sink reduction, molds can be pre-pressurized with gas before melt is injected, or gas can be introduced between the non-appearance side of the part and the mold.