The McCulloch welder’s weight of 55 lb and output of 170 amp result in hand portability with adequate power for most welding applications. The key elements of its design are a light metal, high-speed, two-stroke cycle gasoline engine and a high frequency, capacitor compensated, inductor alternator.
Features of the single-cylinder engine, the power increasing muffler, and the double diaphragm “pressure” carburetor are described, and the effects of unit weight, rotary inertia, and cylinder compression ratio on cranking effort are noted. In addition, the inductor alternator’s magnetic and electrical circuits are explained and the output characteristics given.