For output, either one. Most machines produce Direct Current DC. It is much easier to use and most electrodes can be used with DC. Almost all use Alternating Current AC for a power source - input. Hope this helps.
Stick welding is also more difficult to learn and use, particularly the ability to strike and maintain an arc. Arc welders are available in AC, DC or AC/DC, with AC being the most economical. It's used for welding thicker metals of 1/16 inch or greater.
A dc welder is a lot cheaper by fair of the two
It produces alternating current AC. It is cheaper to build than a DC or an AC - DC welder. Most electrodes can be used with DC. Some can be used for both. Very few are AC only. DC produces a smoother arc, is easier to strike an arc and most machines in industry are DC. Surprisingly a lot of AC machines are on farms as they were cheaper to buy.
If the power tool has brushes to bring the current to the armature it is classed as an universal motor. It will run on DC as long as the voltage is the same potential. On a welding machine the 120 volt receptacle is a DC output and the grinders, drills, etc that are plugged into it work fine.
Some electrodes (welding rods) can be used AC or DC. Some are strictly DC. You may find that most electrodes run smoother on DC. Most industries purchase machines with DC capability.
trains can run on both ac and dc. In India trains run with dc and there is a plan to convert them to move on ac by 2010
A dc is an acronym for direct current & 2 be put in to use,changed to ac which could then be used in welding
AC
No. A bulb can run a AC just a easily as DC.
The power supply in most cars is DC. The alternator may produce AC power, but it is then run through a rectifier, providing DC power.
bcoz it is costly to develop ac...and dc can be store nor ac
The easiest way would be to convert the AC power to DC by using a rectifier diode and a filter capacitor. In that way you can now run your DC motor on DC.