Frequently Asked Questions...
How to make a welder out of a 9v battery and throw away camera flash?
A while back I was at a bar and a guy started talking about how his buddy got in trouble in school for making a small ARC welder out of a 9v battery and a throw away camera flash. He said they welded metal pen caps together and they used small paperclips as the welding rod. Does anyone know how they made the welder? Please tell me and include pictures if you can.
Answer:
A 9v battery is not going to have the current (amperes) to start an arc to weld a metal pen cap in my opinion. You can see how others use car batteries for welding, just Google "welding with car battery." Even those large car batteries have to be wired in series in order to increase the amperage and voltage to sustain a weld.
All welding is basically a circuit, you have a ground (the metal you wish to weld together) with your negative lead attached to it then you have a positive lead that is connected to your fusing material (welding rod), you strike the welding rod against the material to complete the circuit allowing current to flow through the rod and essentially melt because of the high current/volt.
To try to replicate your 9v battery trick I would take 3 9v batteries, then connect a wire from positive lead of the first battery to the negative of the second. Then attach the positive lead of the 2nd battery to the negative of the 3rd battery. You need to attach the first batteries negative terminal to the workpiece (metal cap) and then connect the positive lead of the third battery to the welding rod (paper clip). Be careful because the arc will blind you so you need a welding mask and the batteries can explode.
All and all a really poor idea, I would not try this. Even when I have welded with car batteries I had them far from me and I had a welding blanket over them in-case they blew up.
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