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Welding on a BMW (or any modern car)
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#1
10-19-2013, 10:25 PM
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Welding on a BMW (or any modern car)
Any time I or someone else has done any welding on my 911, we remove the DME completely from the car to be safe.
So that got me thinking - what if you had to weld on a modern car like my E90. NFW you can remove the electronics like you can in my 911. Any one done this? No big deal or is there something special you need to do before hooking the car up to the welder? I almost had to resort to the old "weld a nut to the transmission fill plug" because I'm a f**king gorilla and stripped the 8mm hex out. I got the fill plug off with an air chisel, but it got me thinking about the welding issue.
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Chris M 1985 911 Carrera with a couple cosmetic only mods 2006 E90 330i 1999 E46 328i 
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#2
10-19-2013, 10:54 PM
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I fried several of the 964 electronic components by just using my big charger "hot start" option for countering a dead battery. Can't believe error-ing on the side of caution for actions like this isnt prudent. Though I've seen auto body shops weld on chassis without even disconnecting the battery. Maybe like many things "it depends."
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David I hope to arrive to my death, late, in love, and a little drunk! Just because I don't care doesn't mean I don't understand... Homer Simpson "That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n Some cause happiness wherever they go; others whenever they go. CHAOS, PANIC, AND DISORDER my work here is done... Live without pretending, Love without depending, Listen without defending, Speak without offending Last edited by Trak Ratt; 10-20-2013 at 11:00 AM.
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#3
10-19-2013, 11:25 PM
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Keep the work clamp clean, tght well grounded to the base metal being welded and close to the work and worry little IMO. For example the old rule of thumb to disconnect the positive term is not based on any real protection value. Many people do only that and weld away thinking that the lack of damage was due to their precautions. The electrons want to go from work to clamp or vice verse not wander off where they meet with resistance or lack the capacity to cope.
Doing some. AC TIG with high frequency? You might want to shied the more sensitive stuff.
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http://vimeo.com/29896988 “Those that can make you believe in absurdities can make you commit atrocities.” Voltaire. "There is grandeur in this view of life...." Darwin. The mountains are calling and I must go. “The earth has music for those who listen” Shakespeare. You Matter. (Until you multiply yourself times the speed of light squared. Then you Energy) “We’ve got lots of theories, we just don’t have the evidence’.
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#4
10-20-2013, 09:41 AM
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I always disconnect/remove the ECU when welding on the car (as did BimmerWorld when they installed my cages in the E46 and E92). Not sure if it could have been fried if I didn't, but they're expensive and it's a precaution that's easy enough to do.
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Josh '11 M3
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#5
10-20-2013, 11:52 AM
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That seems to make sense but on a modern car with multiple ecu's/control modules (think benz) it's not very practical IMO.
Most everything is connected with ground straps so to me it's disconnect all or nothing. Nothing usually wins out.
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78 SC, the 'Red Car'
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#6
10-20-2013, 07:35 PM
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I will see what the Manufactures requirements are for welding. I can ask the body shop manu cert holding techs.
__________________
http://vimeo.com/29896988 “Those that can make you believe in absurdities can make you commit atrocities.” Voltaire. "There is grandeur in this view of life...." Darwin. The mountains are calling and I must go. “The earth has music for those who listen” Shakespeare. You Matter. (Until you multiply yourself times the speed of light squared. Then you Energy) “We’ve got lots of theories, we just don’t have the evidence’.
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#7
10-22-2013, 05:45 PM
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Time to upgrade to a digital welder. Don't forget the anti-virus.
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George 2004 BMW 325iT 1998 MB E300 turbo Vindaloo Racing FTW!! 944's are fun When the Wright brothers set out to create a flying machine, Science told them it was impossible.
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#8
10-22-2013, 06:55 PM
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OK the word from I-car, MB and Audi. Disconnect the battery. No welding within 12 inches of any wire. No removal of ECUs mentioned.
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http://vimeo.com/29896988 “Those that can make you believe in absurdities can make you commit atrocities.” Voltaire. "There is grandeur in this view of life...." Darwin. The mountains are calling and I must go. “The earth has music for those who listen” Shakespeare. You Matter. (Until you multiply yourself times the speed of light squared. Then you Energy) “We’ve got lots of theories, we just don’t have the evidence’.
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#10
10-23-2013, 08:53 AM
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Quote:
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Chris M 1985 911 Carrera with a couple cosmetic only mods 2006 E90 330i 1999 E46 328i
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