SDC three phases series generating and welding dual-use alternator SD single phase series generating and welding dual-use alternator SD/SDC Series Generating-welding sets are best driven by an internal combustion engine. They thus form a mobile or stationary power supplying unit which is suited to be used in towns,countrysides,forests,construction sites or on boats for lighting,household appliance, power tools and welding,etc. This machine can serve for either power generating or electric welding individually,and for both welding and a small scale illumination simultaneously.