圆柱形壳体与法兰对接环形焊缝将引起壳体的径向变形及法兰平面度的变化；

The changes of the radial deformation and the flange's planeness are induced by the circumferential weld at the joint between the cylindrical shell and the flange ;

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平行度检测利用测距传感器检测距喷管与发动机法兰之间的距离来调节两平面的平行度。

The parallelism examination is completed by making use of the range finder sensor examining the distance between the range finder and nozzle and the engine flange to adjust two planes parallelism.

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