macroscopic streamline
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结果表明:焊接接头横截面宏观结构特征表现为焊核区的“洋葱环”和热-机械影响区的塑性流线变形,洋葱环的环间距随着距焊缝中心距离的增大而减小;
The experiment result shows that the spacing of onion rings, which is the most prominent features of most friction stir welds, decreases with the distance of onion ring to centerline increasing .
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