Posted by vsteel on August 07, 2017 at 13:25:39 from (137.201.242.130):
In Reply to: Welding on tractor posted by craig45 on August 06, 2017 at 17:19:24:
The reason with the newer stuff you need to disconnect the battery is even though you can have the ground near where you are welding, there are also eddy currents which can wreck havoc with things. Think not a lot of power going through something but think along the lines of ESD.
An analogy that might help is think of a 1 inch pipe that is carrying black permanent ink under some pressure. You are going to turn on the valve and ink is going to flow into a 5 gallon bucket without the lid and then go out a drain in the bottom. Your wife is standing right next to you with her favorite white dress. How much splatter before she says her dress is ruined. Same kind of idea, it doesn't take a lot before things are ruined. The old equipment is like your wife standing there in her favorite black dress. The black dress can take a lot more.
Like the wife in the white dress you might get away with it several times, but is it worth the headache when something does splash and wreck her best dress? Better to take a couple of minutes and unhook the cable, cheap insurance.
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