排气螺丝应该位于开启位置，并且在焊接时要有遮盖以免被火源烧到。
The purge screw should be in the open position and shielded from direct heat when soldering.
因此在各种不同位置进行手工弧焊时，均有良好的焊接性能。
Therefore, it always has good welding properties when carrying out manual arc welding at different position.
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。
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。
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.
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