What is the difference between AC and DC welding?
Both AC and AC/DC welders have a large transformer in them that converts the power from the wall outlet to a voltage that is proper for welding. AC welders simply convert the outlet AC voltage – DC welders convert the voltage AND change the AC from the wall outlet to DC. When the electricity is changed to DC, it has a polarity associated with it. AC (alternating current) power has no specific direction – it cycles back and forth 60 times a second (alternates). DC (direct current) has a positive and a negative, just like a battery (all batteries are DC). When welding, some applications and welding rods require (or work best) with DC current.
