Direct current DC welding has been around for many years. It has been used in heavy duty/high current flow applications to reduce draw on plant primary facilities. In this case DC is powered by three phase power which helps to balance the plant power load. It also operates with a high power factor. DC by definition has the sine wave rectified so that the wave is all positive and never crosses zero. Heating is constant. Large amounts of current and heat can be delivered for large parts or and or conductive materials like aluminum.
