Final Answer:
One of the two types of floors that should not be stood on when welding is a metal floor.
Step-by-step explanation:
Welding safety is paramount, and certain precautions must be taken to prevent accidents or injuries. When welding, it is advised not to stand on metal floors or wet surfaces. Metal floors can conduct electricity, posing a risk of electric shock to the welder. Wet surfaces can enhance the conductivity of electricity, increasing the likelihood of electrical hazards during welding.
Choosing the appropriate work surface is crucial to maintaining a safe welding environment. Non-conductive surfaces, such as dry wooden floors or rubber mats, are preferable to minimize the risk of electric shock and create a safer working environment for welders.