The sand retention apparatus is composed of an upper joint (1), a central tube (2), a retention ring (3), a sealing element (4), a spacing ring (5), an adjusting ring (6) and a bell mouth (7).

此种挡砂器由上接头(1)、中心管(2)、挡环(3)、密封件(4)、隔环(5)、调节环(6)和喇叭口(7)组成。

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Between the chain and ring spacing are like a well-calculated and carefully processed.

连环与环之间的间距都像是有着周密计算和精心加工的。

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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 .

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；

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