编辑同志 :我到防爆车间检查安全时发现 ,有的维修人员在设备上动电弧焊时 ,除了将该设备采取清洗、空气置换、管道断开、加设盲板、仪器监测等措施外 ,还要将与该设备连接的所有地线切断。请问 :电弧焊时 ,电焊机就近接地 (在焊点接地 )后 ,还有必要切断与该设备相连接的地线? Edit comrades: I went to the explosion-proof workshop to check the safety and found that some maintenance personnel in the equipment when the arc welding, in addition to the equipment to be cleaned, air replacement, pipe disconnected, additional blind, instrument monitoring and other measures Turn off all ground wires connected to this equipment. I ask: arc welding, the welding machine near the ground (grounding in the solder joints), there is still the need to cut off the ground connected to the device?