铸锭孔型2的整根丝中粉径分布较均匀，钎剂填充系数较稳定，铸锭孔型1和铸锭孔型3的整根丝中粉径变化较大，钎剂填充系数不稳定。因此，项目选择铸锭2的孔型设计。

The powder diameter distribution in the whole wire of the ingot pass 2 is relatively uniform, and the flux filling coefficient is relatively stable. The powder diameter of the whole wire of the ingot pass 1 and the ingot pass 3 varies greatly, and the flux filling coefficient is not stable. Therefore, the project chose the pass design of the ingot 2.