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  1. #1
    Join Date
    Sep 2008
    Location
    southwestern ohio
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    272

    Default tig welding on cars that have computers

    I have been told that TIG welding on cars that have computers can damage the computers. Why is this? With steel you would be running DC so what would cause the damage?
    This is an automotive discussion forum that has some great infromation

    www.autobodytoolmart.com/shoptalk

  2. #2
    Join Date
    Dec 2007
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    southern California
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    1,783

    Default

    If you use high frequency start, I suppose it could damage the computer, or if welding aluminum in ac with high frequency.
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  3. #3
    Join Date
    Sep 2009
    Location
    Toledo, Ohio
    Posts
    9

    Default

    I would agree, if there is a problem it would probably with the high frequency although I have never heard of it causing problems? The biggest thing with welding on cars is grounding the actual area/part of the car you are welding so the current is not running all over the place (like through wiring or computers) to get to the weld. And itís not a bad idea to disconnect the battery too.

    John

  4. #4
    Join Date
    Dec 2007
    Location
    southern California
    Posts
    1,783

    Default

    That's a good point about setting the ground as close to the work as possible. Also don't want to set the ground on the other side of a bearing with the current going through the bearing.
    Millermatic350P/Python, MillermaticReach/Q300
    Millermatic175
    MillermaticPassport/Q300
    HTP MIG200
    PowCon 300SM, MK Cobramatic
    ThermalArc 185ACDC, Dynaflux Tig'r, CK-20
    DialarcHF, Radiator-1
    Hypertherm PowerMax 380
    Purox oxy/ace
    Jackson EQC
    -F350 CrewCab 4x4
    -LoadNGo utility bed
    -Bobcat 250NT
    -PassportPlus/Q300
    -XMT304/Optima/Spoolmatic15A
    -Suitcase8RC/Q400
    -Suitcase12RC/Q300
    -Smith oxy/propane
    -Jackson EQC

  5. #5
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,395

    Default

    I dont see how disconnecting a battery helps, I never do it, welded on hundreds maybe more cars, trucks, about anything else that moves, I was going to say besides airplanes but actually did a couple things to one.

  6. #6
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    I think every up fit manual Iíve ever read says disconnect the batteries before welding. Some even say unplug the computer.
    I have always felt itís good practice to keep the ground close to your work.
    Caution!
    These are "my" views based only on ďmyĒ experiences in ďmyĒ little bitty world.

  7. #7
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
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    Default

    Keeping the ground near the work is obviously the number 1 thing. I think every technical writer throws the battery issue in just for sport. We have had some lengthy discussions here and only one position I ever heard makes much sense but even that was speculation. No one ever gives reasons why in the recommendation and I know many equipment types, installers never disconnect. I have never had an issue, cant recall where anyone I personally know has either. Have heard some stories, even one where the guy insists he "blew every light bulb out of the car" ha.
    Grounding locally is the deal, new cars have so many potential ground loops due to ground wires in harnesses that never used to be there, ground to the part being worked on.

  8. #8
    Join Date
    Sep 2009
    Location
    Toledo, Ohio
    Posts
    9

    Default

    I was at work one day and one of the guys had just had a battery stolen out of his car so he decides to weld a chain on the hood, down to the bumper. Car was a piece of crap as you might imagine. So we're sitting in the lunch room and BOOM the guy's battery blows! The current found it's way through the battery and apparently didn't like that 200 amp quick charge.
    So you may want to disconnect the battery just in case the current finds it's way through the battery, which is unlikely but better safe than sorry.

  9. #9
    Join Date
    Nov 2007
    Location
    Saskatoon, Sask, Canada
    Posts
    1,270

    Default

    Did he have ground hooked up to the tailpipe?
    Was the replacement battery new? (Why bother with a new battery in a junk car?)
    at home:
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    at work:
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  10. #10
    Join Date
    Sep 2009
    Location
    Toledo, Ohio
    Posts
    9

    Default

    He had it grounder to the bumper and when he welded chain there it was fine but when he welded a piece of chain to the hood thatís when it blew. Good thing the hood was closed! Yes it was a new battery, thatís what we all got a kick out of. Poor guy didnít have two nickels to rub together X-wife or two, couple of kids. He lived in the bar and slept in an apartment on the wrong side of town, always broke.

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