Disconnecting Car Battery for MIG Welding: Is It Necessary?

Hello
This topic was created in connection with a recently discussed topic.

My question is whether you need to disconnect the battery during welding, I heard that you don't have to when welding with a migomat and when welding with a welding machine, and here my question arises, how is it really.

If necessary, what protections should be used so that the battery does not have to be disconnected. because I know that there is such a thing, if there is, maybe someone has a diagram.

I heard that you should always!!! unfasten. I haven't heard of anyone burning electronics while welding, but you can never be too careful. I don't want to be the first one to get burned

It's better to unplug it, otherwise it can discharge it, and if you have some electronics, it can cause trouble.

With a migomat you also need - it is enough that the mass will be weak and there may be problems. When I welded
"quickly" trunk lid lock in a toddler.
Suddenly, if you don't fart .... - it turned out that the battery exploded - it's good that there were some rags on it because I would get shrapnel and acid.
because kindness would cost me dearly.
Since then, when welding, I always disconnect the battery and carefully check the ground connection.

The battery blew up not because you didn't wash it
there was just a little bit of hydrogen in it
I personally never unhook the battery, I put only a very high-power Soviet zenar diode on the posts, it is at 15.5 volts, the battery is even then
voltage stabilizer during welding

Yesterday I was with my car at a friend's place to weld a hole in the exhaust pipe, he was just welding the exhaust system in Opel Omega, without turning off the battery and during welding the alarm went off, he closed the central one and the key was inside......

Well, that's what I mean, we have a body shop and disconnecting the battery is not a big deal but today, for example, after connecting the clamps, the central one with the keys inside will close, it's good that the window was moved away and sometimes after disconnecting the radio, the immobilizers get stupid and that's what it is the whole problem.

Maybe you have some ways to protect the car without disconnecting the battery

ALWAYS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 1

If the car has airbags, it is absolutely necessary to disconnect the battery during any bodywork repair.

It's better to unplug it, otherwise it can discharge it, and if you have some electronics, it can cause trouble.

In the case of cars on mass, there is probably always a minus . This is not always the case with welding. That's why I always disconnect the battery when doing electric welding just in case and so far I've never had any nasty surprises

elektrit wrote:

Disconnect, both pole clamps (clamps) short together

With this shorting of the clamps - I heard that it is not allowed!!??

just unplug the ground cable from the battery and you're done - we won't damage the battery. I don't know if this is enough for electronics, but I think so.

A little unhook the clamp yet would fit one. rudder and expensive radio.

I recently cut the catalyst in my cinquecento without unfastening and nothing happened, but I also heard that it should be unfastened whether it's a migomat or an electric welding machine or something else. Fiat

The battery must be "absolutely disconnected" during welding
because there are stray return currents that can burn everything on the way.
A friend had an accident, he did not disconnect and burned the computer in the car, another burned the radio with the code.
This is not a philosophy, just disconnect only the "plus from the battery"
and it will protect you from burning anything for sure.
Good luck.

as a friend of mine said ... besides, what is the problem with a key and a screw ONE

Hello
Of course, unscrewing one screw is not a problem, but the problem is the decoded radio, the decoded on-board computer, we have a body shop and if someone entrusts the car with it, it is not appropriate to give him a coded radio with a decoded computer.

I am asking for ideas on how to protect the car during welding without disconnecting the battery.

on Allegro I saw some devices protecting electronics during welding, but I did not delve into the details. you would have to look :)

Found: auction no. 51598269 When you test it let me know if it works

My dear colleagues, computers in cars have a constant "30" and constant power supply
mass, if you want to do well, unfortunately, you have to unplug computers.
Removing the clamp is not enough, I saw burnt paths in the computers
that's all from my experience. You need it for sheet metal work
take into account unfortunately.

gumiś_rzesz wrote:

Hello
I am asking for ideas on how to protect the car during welding without disconnecting the battery.

you can't... well, you should buy 2 cylinders of oxygen and acetylene and gas weld

Well, just gas, it's not going to work out well, it'll burn right through, or you'll start the car. For cars, it's just migomats.

I must say that I myself saw them weld the end in the Omega to some guy ... they wanted to do it while you wait .... they did it quickly and efficiently ... but the poor guy did not leave. ... the ECU burned .... so anything can happen ... it's better to disconnect for a moment and work calmly, not to count the losses later

Properly disconnect the minus first (if the cable or the key shorts to the car body, nothing will happen) and discharge the circuits by connecting it to the plus through a 100 ohm resistor > We never make a short circuit in the installation!!!! (unless someone wants to check what will be left of the electrolytic capacitor with a capacity of 1.5 FARAD! in the event of a short circuit because the customer had an amplifier and a capacitor without electronics, i.e. protection - these are cheaper ) besides, now the whole car is stuffed with electrolytes. The second thing that comes to my mind is that I would not leave the wires shorted (circuit closed) during welding due to the induction of current. As for the radio, the customer is just warned in advance that it can be encoded and when picking up the car you will need an instruction with the code. No factory immobilizer should encode. When welding, carefully connect the mass near the welded element and also massage the added sheets (I often saw the mass on the hook and the foreman welded the front fender or door and then was surprised that the hinges were glued together )

I don't believe all these stories
the welding current flows only through the mass/plate/
except for the whole car, but also from the electric one
from your point of view, nothing should happen
damage occurs for other reasons than
welding.
the situation is similar to a bird sitting on
a high-voltage line through which a large one flows
electricity, I do not know of a death due to this

azibik wrote:

I don't believe all these stories
the welding current flows only through the mass/plate/
except for the whole car, but also from the electric one
from your point of view, nothing should happen
damage occurs for other reasons than
welding.
the situation is similar to a bird sitting on
a high-voltage line through which a large one flows
electricity, I do not know of a death due to this

My grandma didn't believe in electricity either, because you can't see it. But why is the washing machine kicking?? )

azibik wrote:

I don't believe all these stories
the welding current flows only through the mass/plate/
except for the whole car, but also from the electric one
from your point of view, nothing should happen
damage occurs for other reasons than
welding.

..... you are wrong

and I advise you to unfasten - when there is something wrong with the mass, the cooler may unsealed - I loved it when welding with a migomat

Unsealing the radiator is probably a coincidence, after all, in decent solutions it is on rubber cushions so that vibrations are not transferred and connected to the mass with rubber hoses.
I am amused by the proposal to short-circuit the battery terminals - probably so that the currents are better transferred through a closed circuit.