大型核电封头，作为核电设备关键部件之一，形状复杂，锻造、加工难度大。
As one of the key components of the nuclear equipments, the complicated large power head is difficult to be forged and machined successfully.
分析了尿素塔上封头体锻造工艺存在的缺陷，认为疏松是造成缺陷的原因。
The defects of forging technology of upper head of 1200mm urea synthesis tower were analysized, and it was thought that the inter defect was loosen.
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