较低的搅拌头平移速度有利于焊缝中心线两侧材料的融合。
The lower translational velocity can improve the coalescence of the welded plates.
焊缝中心线附近的等效塑性应变和结构纹理呈现洋葱状结构。
Onion rings are formed in the microstructural texture and in the equivalent plastic distributions.
结果表明，在表面焊道下面并且离开焊缝中心线若干距离的地方，出现相当高的三向拉伸应力和大的塑性应变积累。
The results show that the triaxial residual stresses and plastic strains can accumulate to relatively high values just below the surface and at a short distance away from the weld area.
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