Electro magnetic induction & TIG question.

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I know anytime you send current down a copper wire there is a chance of  electro magnetic induction if your welding on something with electronics. I have tried to dissconnect everything on my car any time I weld on it but I was wondering if a TIG torch would have a lesser chance of actually damaging any electronic devices since the arc is constant and not constantly going on & off like it would with Stick or MIG?Really old (&faithful) Lincoln SA-250 Diesel, &Longevity 200P
Reply:i don't leave any thing to chance.. you're still introducing a voltage thats higher than 14.4V regardless of the process.. whether it's pulsed DC in a negative or positive polarity, AC, or straight DC.. and OCV is drastically higher than what the breakdown threshhold is for the electronics. i disconnect the ECU and battery every time.. alot of guys will just disconnect the battery.. some cars don't mind it, some do.. on bikes, i unplug the ECU/CDI every time tho.."I know anytime you send current down a copper wire there is a chance of electro magnetic induction".. theres no "chance" sir!! it's EVERY single time.. theres a magnetic field around every electron, let alone that when you flow 1 A per second, it equals 1 coulomb, which equals 6.24x10^18 electrons!!!... to put that into persepctive, thats 18 zeros behind that "6.24"  ...and also 1 amp-hour is 3600 coulombs.. all in all, that an assload of electons flowing when you beigin an arc at 150 amps or so..     thus the reason i don't every chance it.. even on my own stuff. .lol good luck and have fun bro!!Last edited by whitehendrix!; 11-29-2008 at 08:02 PM.http://kawispeed.com/ -moderator and tech deluxewww.myspace.com/trickortrack -cuz i have no life
Reply:Ever TIG weld in a room that had florescent lights wire with romex instead of wire in steel conduit? Won't happen in every such room but the high freq of tig can make the lights go crazy. The high freq can radiate in all direction like radio waves. You could go with lift arc or scratch start but I don't see that being much different than  DC stick. Ever run 7018 on DC+? It's runs smooth as butter. With stick or mig all the power is going to be confined to the most direct path between the ground and arc.Tough as nails and damn near as smart
Reply:Thanks for the input, I always disconnect the ecu,wiedband, 2step,& injector driver (im pretty paranoid). I just wasnt sure if the TIG process was any bettter for that.Really old (&faithful) Lincoln SA-250 Diesel, &Longevity 200P
Reply:i mean, i would assume no.. lol.. current flow is current flow.. i do like tresi's thought on EMI however.. i had not taken that into consideration.. thats just my personal opinion tho, bro.. the amount of current induced by RF and EMI should be microamps at best., unless the electronics (ECU) are RIGHT beside the transformer core or VERY close to the arc.. an arc will make pretty much just radio noise, and trasmit AM and FM pulses on a very wide frequency range. the electromagnetic pulses from coil saturation and field collaps should be pretty low.. i'm wondering about the ballast thing tresi mentioned now!! lol.. wonder if a magnetic ballast would differ from anelectronic one.. i would assume the electronic ones are more prone to disturbance..anyway.. ya, WS.. you're golden, brother!!     you're good unplugging everything, ut i almost would say theres no difference as far as welding modes and all is concerned..   (but hey.. i could be wrong..)http://kawispeed.com/ -moderator and tech deluxewww.myspace.com/trickortrack -cuz i have no life
Reply:Originally Posted by WS6HUMMERThanks for the input, I always disconnect the ecu,wiedband, 2step,& injector driver (im pretty paranoid). I just wasnt sure if the TIG process was any bettter for that.
Reply:just out of curiosity, whats this on?http://kawispeed.com/ -moderator and tech deluxewww.myspace.com/trickortrack -cuz i have no life
Reply:Originally Posted by whitehendrix!i mean, i would assume no.. lol.. current flow is current flow.. i do like tresi's thought on EMI however.. i had not taken that into consideration.. thats just my personal opinion tho, bro.. the amount of current induced by RF and EMI should be microamps at best., unless the electronics (ECU) are RIGHT beside the transformer core or VERY close to the arc.. an arc will make pretty much just radio noise, and trasmit AM and FM pulses on a very wide frequency range. the electromagnetic pulses from coil saturation and field collaps should be pretty low.. i'm wondering about the ballast thing tresi mentioned now!! lol.. wonder if a magnetic ballast would differ from anelectronic one.. i would assume the electronic ones are more prone to disturbance..anyway.. ya, WS.. you're golden, brother!!     you're good unplugging everything, ut i almost would say theres no difference as far as welding modes and all is concerned..   (but hey.. i could be wrong..)
Reply:Ooo.. knob and tube is scary.. lol.. BUT, its acutally one of the best wiring methods, believe it or not. DEFINITELY magnetic ballasts.. i've done enough lighting repair and installation to certainly promise that.ya.. emt is amazing stuff.. it's grounded, therefore becomes a shield as well. good stuff. that is interesting tho,.. i never considered that, and now, i'll keep that in mind should i have to do wiring in a fabrication-type area. by code, all commercial stuff HAS to be wither MC or in conduit.. so, unless its residential, halfassed commercial, ir PVC conduit, EMI shouldn't be too much of an issue..thank you tho for that post.. very good to think on..http://kawispeed.com/ -moderator and tech deluxewww.myspace.com/trickortrack -cuz i have no life
Reply:Originally Posted by WS6HUMMERI know anytime you send current down a copper wire there is a chance of  electro magnetic induction if your welding on something with electronics. I have tried to dissconnect everything on my car any time I weld on it but I was wondering if a TIG torch would have a lesser chance of actually damaging any electronic devices since the arc is constant and not constantly going on & off like it would with Stick or MIG?
Reply:The high frequency start and/or run, of TIG is an RF field.Consider that the HF start, can jump a spark in air, maybe a good inch, soit's not any more 'vehicle friendly' that MIG, etc.       Once again, close, really good, low resistance grounding stops problems.Blackbird
Reply:Originally Posted by whitehendrix!just out of curiosity, whats this on?
Reply:Originally Posted by dave powelsonThe high frequency start and/or run, of TIG is an RF field.Consider that the HF start, can jump a spark in air, maybe a good inch, soit's not any more 'vehicle friendly' that MIG, etc.       Once again, close, really good, low resistance grounding stops problems.