AC and DC welders are both shielded metal arc welders but differ in the electricity they use. AC welders use electric voltage directly from an alternating current outlet. DC welders use the same AC voltage but convert it to direct current voltage.
Types
Shielded metal arc welders are available to use AC voltage or DC voltage, but both options are available in one machine.
Warning
DC welding electrodes must only be used on a DC machine, even though AC electrodes can be used with either machine.
Benefits
AC welding can be used to weld magnetized metal, but DC welding is easier to use and can weld thinner metals.
Disadvantages
AC welders pulse the arc every time the alternating current changes polarity, which makes the arc harder to control. DC welders are more expensive.
Considerations
AC welders are cheaper and can weld thicker metals, while DC welders strike an arc easier and make a cleaner weld. An AC welder is fine for most home project jobs, but if welding is a regular chore, you will probably need AC and DC at some point.
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