When the annular parts of a spaceflight apparatus were welded, the centre of the rotation of electron gun and the centre of the annular weld are usually not superposed.

在真空电子束焊接航天器件的圆形焊缝时，由于工装等原因，出现电子枪回转中心与焊缝圆心不同心现象。

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During the welding process, the computer will modify the position of the electron gun based on the deviation to make the electron beam spot centered on the annular weld groove.

在焊接时利用处理后的偏差值在圆形焊缝相应位置不断修正电子枪的位置，从而达到电子束束斑与焊缝自动对中的目的。

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There are two types of cracks in the area next to weld seam of annular chains for mining during welding process, ie, teared type and punctured type cracks.

本文对矿用圆环链临焊缝部位在焊接过程中产生的裂纹进行了分析。

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