kaarkeevituse vooluallikas kindla kujuga välistunnusjoone e karakteristikaga, mille puhul kaarepinge keevitusvoolu kasvades märgatavalt väheneb (vt püsivvooluga vooluallikas), a welding power supply with characteristic designed to minimize changes in welding current as the welding voltage fluctuates within anticipated limits; such kind of welding power sources are usually constant current power sources (see: constant current power source)