Disconnecting Car Battery for MIG Welding: Is It Necessary?

to hutsul
because you are standing on the ground, if you levitate you will not
kicks
if you're so good, draw the current flow
while welding and back it up with some theory
and don't rely on grandma

What about theories! Theories were written by others and we should follow them. If you don't believe that welding can kill electronics, you probably won't believe that a bra can kill a woman either... and I've heard of at least two such cases where the current induced in the wires used to stiffen the bra (about 10 cm) during a lightning strike He took two souls from this world. But I will still refer to those stiff hinges in the door - let's say that the mass is fastened somewhere to the engine and we weld sheets. Imagine that there is a weak connection between the engine and the body, the mass is rusty and there will be a spark somewhere .... after all, in order for a spark to occur, you probably need a potential difference, and you can't deny that it is dangerous...

azibik wrote:

to hutsul
because you are standing on the ground, if you levitate you will not
kicks
if you're so good, draw the current flow
while welding and back it up with some theory
and don't rely on grandma

culture!

When welding elements in the car, there is a large current flow through the car body ... as everyone knows, the current flow causes a field and can form a potential in other parts / elements, besides, the arc during welding radiates EM waves quite well, such a delicate comparator or some mosfet can be damaged. and such elements can be stuffed in the car
btw there is a 15V drop across the arc flowing through air*

;] I say that he can kick this man and his > Z

disconnecting the battery doesn't help, there are many electronic cases, it's worth a few pennies on Allegro anyway. The overvoltage protection device, as they say, helps to spend PLN 60 and not to pack hundreds of zlotys later. and as welders say, apply the mass as close as possible to the weld, it will reduce the possibility of overvoltage

Hello
I can see that the topic is developing and reading all the posts I am more and more afraid of these cars in the hall and maybe someone has a diagram of such a device that would protect the electronics or some ways to protect the electronics from damage.
GREETINGS

gumiś_rzesz wrote:

Hello
I can see that the topic is developing and reading all the posts I am more and more afraid of these cars in the hall and maybe someone has a diagram of such a device that would protect the electronics or some ways to protect the electronics from damage.
GREETINGS

There are no such !!! the only certain protection is to remove the key elements, e.g. a computer, but the newer the cars, the more boxes that can break down, there is no good advice for this .. usually when the battery is disconnected, everything is ok ... and sometimes something hits; it's such a lottery

The case of disconnecting the battery is very similar to welding pipes in the vertical block. There are cases that after such welding, the SAT tuner, radio equipment, and sometimes the electronics of the refrigerator stopped working after such welding. And probably someone will say, after all, the pipes are grounded, so what can happen to the user's installation? And yet it is happening! There are plenty of theories on this subject - the conclusion is one: do not philosophize what, how, why - just disconnect the battery from the installation and calm down, other damage that may occur during welding cannot be avoided in 100%. Damage to the battery can be avoided and it is worth disconnecting it.

Hello, I am refreshing the topic because when I welded wheel arches in my Opelek, the battery was disconnected and, unfortunately, the result was damage to the diodes on the alternator. my cousin who weld in the Opel workshop also had the same thing.