When the electric welding equipment catches fire, you should first switch off the power supply and then start extinguishing the fire. Before cutting off the power, you cannot use water or foam fire extinguishers to put out the fire, otherwise, it is easy to cause electric shock. You should use dry powder fire extinguishers, carbon dioxide fire extinguishers, carbon tetrachloride fire extinguishers or 1211 fire extinguishers to fight the fire. Dry powder fire extinguishers are not suitable for extinguishing fires in rotary DC welding machines.