Covering, sub-packing, wire feeding
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A small cold air cupola or a single-furnace hot-air cupola can be changed to a double-furnace high-efficiency internal hot-air cupola, which can increase the hot air temperature from 200°C to about 400°C.； Promote the application of porous plug desulfurization technology, develop spheroidizing processes such as capping, sub-packing, and wire feeding to improve the quality of ductile iron castings. How do you translate the red part?
Translation of the content of the searched papers for reference wire feeding spheroidization process: Feed Wire Method http://www.chemyq.com/expert/ep82/817300_3E501.htm covering ladle covering subcontracting rotating ladle http://www.chemyq.com/expert/ep58/571334_F82F8.htm