分析了工厂网带炉条件下淬火织针表面硬度不足的原因。
Analyse the reason that surface hardness of quench needle is not enough under original production technology circumstance of factory.
若搅拌针表面是光滑的，搭接界面在厚度方向上的迁移减小，但返回边界面向焊缝中心延伸的程度增大。
If the surface of the stir pin is smooth, the migration of interface in the thickness direction reduces, but the interface spreading to the weld is serious.
其中一个珠子用针固定在玻璃表面，它转动的时候另一颗珠子就会围绕着它旋转。
One of the beads was pinned to a glass surface so that as it spun the other rotated around it.
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