Generally, when welding and cutting operations are carried out in basements, tunnels, metal containers and relatively closed places, due to special factors such as poor air circulation, inconvenient access, insufficient light, poor site and inconvenient activities, accidents are easy to occur in welding and cutting operations and it is not easy to rescue. Therefore, the following safety measures must be strictly taken.

（1）作业前必须认真仔细地对作业场所内外的情况调查清楚，要查清室外的建筑或其他结构对室内动火焊、割是否有影响，室内是否有易燃易爆物质，必要时应先对室内的气体进行取样分析，确认后，才能进入室内操作。

(1) Before operation, the situation inside and outside the workplace must be carefully investigated. It is necessary to find out whether the outdoor buildings or other structures have an impact on indoor hot welding and cutting, and whether there are flammable and explosive substances in the room. If necessary, the indoor gas shall be sampled and analyzed to confirm safety before entering the room for operation.

（2）乙炔发生器、氧气瓶、电焊机均不准放在动火焊、割的室内。要仔细检查氧-乙炔管道和焊、割炬是否漏气，严防氧-乙炔气体体积聚在室内而引起爆炸事故，暂停焊、割时要把氧-乙炔管道和焊、割炬拿出室外。并打开所有门窗或阀门，尽可能保持空气流通，必要时要采取机械通风。

(2) Acetylene generator, oxygen cylinder and electric welding machine are not allowed to be placed in the room of hot welding and cutting. Carefully check the oxygen acetylene pipeline and welding and cutting torch for gas leakage, and strictly prevent the explosion accident caused by the concentration of oxygen acetylene gas in the room. When welding and cutting are suspended, take the oxygen acetylene pipeline and welding and cutting torch out of the room. Open all doors, windows or valves to maintain air circulation as much as possible, and take mechanical ventilation if necessary.

（3）用焊割设备进行电焊操作时，焊、割场所需保持干燥，严格检查绝缘防护装备是否符合要求。在金属容器内作业时，焊工不准把头、背等或未带绝缘物的部位碰着金属容器。照明设备一律采用低压照明灯。

(3) When using welding and cutting equipment for electric welding, the welding and cutting place shall be kept dry, and the insulation protection equipment shall be strictly checked to see whether it meets the safety requirements. When working in metal containers, welders are not allowed to touch their heads, backs, etc. or parts without insulation against metal containers. All lighting equipment shall adopt low-voltage lamps.

（4）禁止把氧气通入室内用作调节操作场所的空气

(4) It is forbidden to introduce oxygen into the room to regulate the air in the operation place