[Gmecm] Welding vs. computers

[Chris Reynolds]

It is so simple to unplug the 1, 2, 3, or 4 oxygen sensors that are in most cars before striking up the arc.   That could save high dollar sensors and a PCM.   I always unplug the sensors before driving to a muffler shop and handing over the keys.

mark krawczuk <krawczuk at dodo.com.au> wrote:  hi, i `ve done welding on exhausts and chassis on vehicles fitted with 
computers and havent removed them.

i `ve kept the earth clamp very close to where i`m welding, i.e if welding 
on teh exhaust , dont put the earth clamp on the chassis, .
mark k


----- Original Message ----- 
From: "Doug Chase" 
To: 
Sent: Tuesday, November 21, 2006 5:20 PM
Subject: RE: [Gmecm] Welding vs. computers


> It definitely makes sense to me that electronics could be subject to 
> damage
> if the proper precuations aren't taken. Grounding to the chassis while
> welding on the exhaust, for example, could have an O2 sensor as a 
> casualty.
>
> It also makes sense that completely removing components will protect them
> from being damaged by things I haven't thought of.
>
> What does NOT make sense is to why disconnecting the battery, a common
> precaution I've heard, would protect anything. It seems to me that it 
> might
> be even better leaving it in. At least that way you have a very large
> capacitor to protect against voltage spikes on the +12 side of things.
> Thoughts?
>
> Doug Chase
> www.chaserace.com
> 425-269-5636
>
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On 
> Behalf
> Of bcroe at juno.com
> Sent: Sunday, November 12, 2006 4:05 PM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] Welding vs. computers
>
> I second that. Completely disconnect delicate electronics before welding.
> A car isn't one mass of metal. Many parts are isolated by rubber,etc. So
> things like ground straps and exhaust pipes may be taking big currents,
> which aren't so predictable. Not only the resistance is a factor, but the
> arcing weld current will respond to inductance in the circuit. If the
> original ground system isn't in perfect condition, currents have been 
> known
> to find their way through things like shift cables.
>
> Do tie your welding ground to the piece of metal being welded, reasonably
> close to the weld. If there are 2 pieces, tie them electrically together.
>
> Bruce Roe
>
> 12 Nov 2006 Rexdina at aol.com writes:
>> The fact is that while electricity does seek the path of least
>> resistance, not all of the current is going to necessarily do that.
>> Some of it can go through any of the numerous paths to ground. Best to
>> disconnect or entirely remove potential sensitive electronic
>> components. Yes, it's a hassle, but so is trying to find out what is
>> "cooked" when you do ruin one. And it can get expensive.
>> Harry
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