Medium Frequency Welding Machine , DC Aluminum Products Welding Machine DESCRIPTION MF DC Inverter Spot Welder is a set of advanced welding equipment. The three-phase power supply, through rectified by a special inverter, is converted into 1000Hz AC voltage and then is transmitted to a medium frequency transformer so the current is rectified in order to supply DC welding current. The advantage is that it helps to greatly reduce the energy of iron core material, as the