"Where there is solidification, there is air gap", air gap is the indispensable condition for an ingot to be pulled out of a mould smoothly.

“有凝固就必然会有气隙的形成”，并且气隙的存在是铸坯能够顺利拉出结晶器的必要条件。

youdao

"Where there is solidification, there is air gap", air gap is the indispensable condition for an ingot to be pulled out of a mould smoothly.

“有凝固就必然会有气隙的形成”，并且气隙的存在是铸坯能够顺利拉出结晶器的必要条件。

youdao