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Old 10-12-2009, 07:14 PM
02mx-5 02mx-5 is offline
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Default Arc welding with a battery charger?

Is it possible to arc weld using a large battery charger? I hooked it up to my pocketbike to start it and touched some metal togeth by accident. it looked as though i was welding as i saw the arc. If i were to put a rod in the positive clamp could i weld if i set it to 12v high?
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Old 10-12-2009, 07:22 PM
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no wont work... welding rods needs like 50-80 ocv (open circuit voltage) to operate... 12v wont light them
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Old 10-12-2009, 07:28 PM
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you can weld with 3 car batteries wired in a series.
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Old 10-12-2009, 08:01 PM
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You can ghetto rig a stick welder w/2-3 few car batteries and some jumper cables. Certain truck alternators make great TIG welders.
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Old 10-12-2009, 08:54 PM
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12V charger can't keep up with the amerage flow, and won't start the arc at all.

With my pile o' batteries, 200-300V is achievable far too easily lol.

Although charging them back up will be a PITA.
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Old 10-13-2009, 10:27 AM
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Ok, i had to ask.
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Old 10-13-2009, 10:33 AM
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Quote:
Originally Posted by Kenny_McCormic View Post
You can ghetto rig a stick welder w/2-3 few car batteries and some jumper cables. Certain truck alternators make great TIG welders.
I can see this ending badly.. Very badly..
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Old 10-13-2009, 01:01 PM
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How so?
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Old 10-13-2009, 01:39 PM
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You can stick weld thin stuff (with a thin rod) with a single car battery. It's difficult to strike the arc and maintain a welding puddle however. 24V (two batteries) or 36V (three batteries) is the range I'd recommend playing with if you want to weld with car batteries. I've done it many times and it works reasonably well.

Car and truck alternators work well also and you can use an old interior/dash light dimmer in series with the field coil to control current somewhat. Obviously not all welding jobs demand full power and thinner stuff can blow through.

A car charger can provide it's start rating only for a few seconds, typically 15-20 max. These things are designed to suppliment a weak battery and not replace it entirely. This is why if the battery is completely dead you cannot start it with a charger/starter - the battery isn't helping at all and probably sucking more current than the stater, at least initially.

Just be very careful. Amps can kill you very easily.
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Old 10-14-2009, 12:32 PM
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Youtube it!
I did last night and theres a really good video demonstrating how to do it, I was impressed on how good it welded, considered they are car batteries.
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Old 10-14-2009, 02:58 PM
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U could probaly hook a tractor generator or two up to a pully system and engine and make some sort of circut to make the flow variable and then you use jumper cables and walla.
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Old 10-15-2009, 11:14 AM
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i touched the two terminals together on a small 12v battery charger, and it seemed to create a small arc.
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Old 10-15-2009, 05:22 PM
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Quote:
Originally Posted by ApocGoD View Post
I can see this ending badly.. Very badly..
Even if it didn't arc and just stuck and shorted, the batteries are powerful enough (SLA car batteries have major amerage), it would just burn and glow the stick/wire up until it fried.

No harm done, happens if you're bored with a wirefeed ARC too.
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Old 10-15-2009, 06:19 PM
Kenny_McCormic Kenny_McCormic is offline
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According to my old man, back in the day before he had a real load tester he would short batteries with a piece of coat hanger wire. If it burned the wire in half, it was a good battery.
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