Welding the use of electricity a thermal origin this will cause the Ark has occurred between the wire connected to the workpiece for household 220 volts
Welding that uses electricity as the origin of heat, which will cause the Ark.
Between the wire connected to the workpiece. For 220 volt House current cannot be used because the voltage is too high, it may harm the operator. In the high voltage is not required, but need as much flow. Therefore, the welding machine must look like this