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Old 11-23-2005, 07:54 PM
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Kringold, Good point!

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Old 11-24-2005, 10:50 AM
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Yes, the work clamp is not grounded to anything. It is deliberately "floating" so that the flow of current is from the electrode back to the welder without going through any other paths.

I would definately disconnect the battery before welding. Electromagnetic fields are created by welding that could alter the computer programming even if it doesn't zap the circuits. Just as you hear the welding electromagnetic interference on radios nearby, these signals are present on the input leads to the engine computer when you are welding. The memory is more likely to be altered with the 12V power applied. I think it's also good idea to remove the computer AFTER the battery is disconnected, just because they are so expensive.

The "keep alive" gadgets keep the computer powered up. They don't serve a purpose in this application because you really want power to the engine computer memory off so it doesn't get accidentally programmed (altered). The keep alive device is effectively a small power source that maintains 12V on the system but it doesn't have enough current available to harm you if a wrench gets across it.
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Old 11-24-2005, 11:11 AM
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Quote:
Originally Posted by milo
If you let the smoke out of some computers it'll kill em.
I've noticed that to be true with most electronics. LOL!
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Old 11-24-2005, 02:14 PM
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Fiurbird, You are right, definitely disconnect the battery. I did not mean to make it sound as if disconnecting the battery is a waste of time but all too often someone will think they can just do about anything they want with the welder without harm because the battery is disconnected so it will be safe. One still needs to exercise caution when welding on any vehicle, computer or not. It really is simple just look at where the welding will take place vs WORK clamp and ask "what will the current travel through in this configuration"? If welding on a door and clamped to THAT door then that is all that will be affected but if clamped to the frame and welding on the door then every thing capable of carrying current between body and frame will share the load plus the door hinges also
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Old 11-24-2005, 02:18 PM
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ICAR guidelines say don't weld within 18 inches of a computer. Just disconnect the battery and the 18 inches is all that is needed. It also suggests don't allow your feed line, ground cable or power supply cord to be in a circle, this could produce an electro magnet effect.

Brian
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