Disconnect Battery When Welding - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 5 Old 07-29-2015, 05:15 PM Thread Starter
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Disconnect Battery When Welding

I don't know why I'm even starting this thread, just been thinking about it today, and thought I'd throw it on here and see what people think.

When you are welding you are dealing with a lot of electricity. With sensitive electronics, bad things can happen.

My thoughts stem from the recommendation to disconnect the battery before welding. That certainly isn't a bad practice and I'm not telling anyone they shouldn't disconnect the battery. However, I don't see how it does much to prevent damage to other electronics.

If you are welding on the body or frame of a vehicle, even with the battery disconnected, all the sensitive electronics are still connected through grounding to the body and frame. While the battery may no longer be in the circuit, the battery voltage isn't the problem, it's the possible errant voltage, frequency and RF from the welder that is the issue. Having the battery out of the system seems of little use.

Now, the exception to this could be if a stray surge from the welder caused and errant circuit to momentarily activate in a piece of electronics, at which time the available battery voltage is what would cause the damage. As I said, it's definitely not a bad practice. I just don't see how it greatly mitigates danger to electronics. If I'm wrong, awesome, I want to learn something, school me.

At my job, the equipment I work on often has a notice that all sensitive components should be disconnected before any welding. And indeed, my practice is to disconnect all electronic components if at all possible. This would be far less practical in a Jeep or other automobile because of the huge number of electronics, but I just wondered what others on here thought.

So what do you think, does disconnecting the battery alone give you a warm fuzzy feeling when you weld on your Jeep? Or do you cry a little because you wanted to disconnect everything (but didn't because it would suck and be virtually impossible)? By the way, I will likely be in the latter category when I weld something on my Jeep, haha.

Last edited by BigTB; 07-29-2015 at 05:42 PM.
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post #2 of 5 Old 07-29-2015, 05:38 PM Thread Starter
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I suppose a battery is a conductor (current and voltage can pass through it), so therein may lie the problem. Any surge on the ground could pass through the battery to the positive side of the circuit and over-volt the components. So I suppose it makes sense.

Look at that, just typing it out allowed me to come to my own conclusion. That's why I post things. It's like talking it out, except that I don't have anybody to talk to right now, so I type it on here instead.

Edit: I still don't know that components would be completely safe with only the battery disconnected, but I suppose that's why it makes a difference.

Last edited by BigTB; 07-29-2015 at 05:42 PM.
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post #3 of 5 Old 07-29-2015, 06:52 PM
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You are correct in your assumptions , the reason you want to disconnect the battery is not errant voltages but impedance ( the resistance to the flow of currant ) currants in a welder are square wave or constant and Can have an effect on some electronics , Unlikely yes but anything is possible .

I really wish I could predict the future , and know which electronic device to disconnect before I fry it . but that's not the way things roll for me . I have to always learn from my mistakes .
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post #4 of 5 Old 08-03-2015, 07:09 PM
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Make sure you connect the ground as close to where your welding as possible so that no current will pass through any mechanical or electrical circuits. As stated above always disconnect the negative lead on the battery.
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post #5 of 5 Old 08-03-2015, 07:16 PM
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As a rule, I always disconnect the battery entirely from the circuit and weld as close to the work as possible. The other alternative is one of these.


Originally Posted by braindead0 View Post
Some folks are fine with being screwed over, perhaps finding confrontation to be more stressful than just living with whatever the problem is. These are excellent consumers, manufactured to the finest specifications.
Reformed Jeep addict... Jeepless for now.
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