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Thread: Welding

  1. #1
    Member of the Orb Alliance packman's Avatar
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    Question Welding

    Does anybody have any tips or warnings for welding body panels on cars with an ECU? I am going to replace the driver's side floor panel from front to back. For whatever reasons, that side rotted out pretty bad. The other side has been oil-slicked and is rot-free. I will cut the floor out of the '88 MGM at the junkyard and weld it in place of the CV floor. I don't know how that will affect the ECU.

  2. #2
    The Brown Blob 87gtVIC's Avatar
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    Disconnect the battery just to play it safe.
    ~David~

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    Quote Originally Posted by DerekTheGreat View Post
    But, that's just coming from me, this site's biggest pessimist. Best of luck

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    Thanks I was planning on doing that; usually do that when disconnecting sensors and such. Just didn't know if the ECU needed to be removed or disconnected.

  4. #4
    The Brown Blob 87gtVIC's Avatar
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    Some will say its fine, but why risk it? Me I would pull the terminals on the battery to be sure. I hate electrical problems because they can be difficult to figure out. You can even remove the computer if you wish.
    ~David~

    My 1987 Crown Victoria Coupe: The Brown Blob
    My 2004 Mercedes Benz E320:The Benz

    Quote Originally Posted by DerekTheGreat View Post
    But, that's just coming from me, this site's biggest pessimist. Best of luck

  5. #5
    I'm an air-conditioned gypsy gadget73's Avatar
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    Mine has been welded on a few times, other than unhooking the battery no special precautions were taken. ECM hasn't blown up.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

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    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  6. #6
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    ditto.
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
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  7. #7

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    Always unhook the batteries both + & -
    Set you ground clamp as close as possible to the area to be welded with a clean connection.

    The key to this is the elimination of the weld circuit searching for a path of least resistance for a ground. Fried electronics are not good..

    also ecu has a pretty simple plug to disconnect for the full protection factor

  8. #8
    Beater gonna beat sly's Avatar
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    I didn't disconnect anything on the 88 when I welded the driver inner door skin back together. But I didn't turn on the car while I was doing that either. I was using flux-core wire in a cheapo Harbor Freight 90A welder... so I doubt there was much chance of anything going wrong. Didn't cook anything either.

    There is no issue with brazing or torch welding since you're just using heat.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
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    ... and it should all work like magic and unicorns and stuff.
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  9. #9
    I'm an air-conditioned gypsy gadget73's Avatar
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    other than risk of fire of course. I prefer torch welding. can't see for shit with the electric metal glue gun and the results are predictably horrible. Brazing or torch welding is like big-boy soldering and I can see what I'm doing.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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