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How to Build a 24V Welder

Welding can be done with alternating current, or AC, which is what most households run on, or direct current, commonly known as DC, which is supplied by batteries. To weld with direct current you need to have high enough power to make the weld penetrate deep enough. It's possible to use two 12-volt batteries hooked up in series to generate 24 volts for sufficient power for welding. The military uses this method to do emergency welding in the field.

Things You'll Need

2 12-volt batteries
3 jumper cables
Welding rod
Locking pliers
Welding mask

Instructions

- 1
  Connect the batteries in series so they give you 24 volts. Do this by connecting the negative terminal of the first battery to the positive terminal of the second battery with a jumper cable. Make sure you have a solid connection to the terminals.
- 2
  Connect the positive terminal of the first battery to the metal item to be welded. You now have the power to weld. Connect the negative terminal of the second battery to locking pliers. Put your welding rod into the jaws of the locking pliers.
- 3
  Clean the part that needs welding. The best welds are made with clean surfaces. Remove any oil or other surface debris. If the area to be welded has rust, remove it with a wire brush.
- 4
  Protect your eyes by putting on a dark welding mask. Protect your arms with long-sleeved clothing made from natural fibers.
- 5
  Apply the welding rod to the metal parts to be welded together. Create an initial weld pool. This usually takes one or two seconds. Once a metal pool is created, start extending the weld pool across the full area to be welded. Don't go too fast. A general guideline is to use an inch of welding rod for each inch of weld. For a good weld, keep a consistent distance from the welding rod to the metal.

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