The pin shape is the main factor of affecting the flow pattern of the plasticized metal in the weld.
搅拌头形状是影响焊缝塑化金属流动形态的主要因素。
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.
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。
The bolt fastening metal structure of tower crane and pin structure without deformation, no weld crack.
塔吊的紧固金属结构的联接螺栓和销轴，结构件不得有变形，焊缝不得有裂纹。
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