Hot Start is a built-in device which produces an ideal boost to the output voltage, which eases electric arc ignition. Anti-Sticking is a built-in device that switches off the welding power source if the electrode sticks to the material being welded - thus preventing against overloading the unit and easing removal of the electrode. Arc Force prevents against short-circuits. It can be manually adjusted on high output machines and is pre-set on all others.