What do construction safety students mean by "six prohibitions" and "six musts"

Welding and cutting operations should be "ten no welding";

1, unlicensed personnel are not allowed to weld;

2, key departments or important areas are not allowed to be welded without approval;

3, don't know the situation around the welding site are not allowed to welding;

4, near the combustible materials, no safety protection measures, no welding and cutting without supervision;

5. Containers containing flammable, explosive and toxic substances are not allowed to be welded and cut without thorough cleaning and unsupervised;

6, don't understand the internal situation of the welding object are not allowed to welding;

7, sealed or pressurized containers are not allowed to be welded;

8. When the welding and cutting machine has faults such as electric leakage and air leakage, welding and cutting are not allowed;

9. When there are many people near the welding and cutting site, welding and cutting are not allowed without isolation and shielding protection measures;

10, welding and cutting are not allowed in the fire-forbidden area without going through the hot work approval procedures.