The ALT 304 CC/CV inverter is the first multiple-process welding power source with Auto-Line technology, which eliminates the need for power linking accessories. It also allows operation from straight DC power, such as the third rail of a subway system. As long as the primary power remains within a 185- to 635-volt range, the operator will not experience a fluctuation in welding arc, according to the company. The 78-pound unit has a welding output of 5 to 400 amps and 10 to 35 volts. It can carbon arc gouge with 3/16-inch diameter carbons.