Disconecting the battery does nothing but isolates the battery. It does nothing to protect the sensors or ECM. If you wanted to "protect" them, you would have to unplug and remove them. However, this is not needed. Electricity is lazy, in that it will take the easiest path to ground. If you keep the ground clamp close to the work, the electricity will never make it to anything else.
So, to answer your question. No I never disconect the battery on anything I am welding. But i keep my ground clamp close to the work.
i disco when i weld. i blew an ignition modual on a dune buggy by not discoing. and i was grounded right next to where i was welding. just be carefull when you disco some vehicles that have anti theft devices.
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Two fish swim into a concrete wall. One turns to the other and says 'Dam!'
It is EMC! Electrmagnetics. The electronics are protected when the are not pligged in(for the most part) because the transistors are not stiching and the othe other electronics dont have current flow. Add trons to the picture and have the electronics up and you have a huge recipe for letting smoke out that will now go back in. For the most part everything powers down on the YJ with the Key off. So its not as big a deal, but I guarantee that on the new cars the battery is disconnected when battery power is the only thing going to a module on the car and it cost $1000 to replace! I let the smoke out for a living doing Electromagnetics and if the only thing I loose is 5 minutes diconnecting it and it lessens the chance of the carnage I see here at work....I'll spend the time