welding precautions - Alfa Romeo Forum
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welding precautions

i need to practice a wee bit of welding on the spider, what do i need to disconnect on a modern car for welding, i take it that disconecting the battery is not enough so what else needs to come off so i don't fry anything expensive?

engine ecu?, where is it on a ph2 spider?
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To be absoolutely safe, I'd consider disconnecting all these :

engine ecu ( on throttle body )
Climate control ecu ( the 3 knobs on the dash )
airbag ecu ( under rear seat )
CODE ecu ( yellow thing by fuse box )
Wipers ( under scuttle cover )
main instruments
ABS ( engine bay, nearside bulkhead )

I'll see if I can think of anything else that may be sensitive ...
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Well i never disconnected anything on any of my cars (and gtv was welded few times) and never had any problems. Whatewer you weld on a car try to get the -pole as close as possible to the welding place (on the same panel or so)

You can disconnect the battery to feel better if you want
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& make sure there's no flamable material anywhere near (carpets, soundproofing etc.).
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Make sure anything taken off gets put back on, someone started a BM I had with an earth lead off the engine and toasted an injector. It probably isn't possible on your car but don't use a wheel nut as an earth, it can arc inside the bearing leaving it knackered very soon.
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Make sure you are no where near fuel lines, also underseal can catch fire and burn.

A fire extinguisher, some wet rags and a helping hand keeping an eye on things for you are good precautions.

The last time I welded an Alfa (156) I disconnected the battery earth. I had no problems with the electrics.

I also had to remove the seats and carpets from inside the car.
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The only thing I've ever disconnected is the negative terminal on the battery. Have welded cars with nothing disconnected and they've still been ok but wouldn't recommend it.
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when i had welding done on my GTV my local Alfa Specialist only disconnected the battery and there were no problems at all
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