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Is it necessary to disconnect the battery before MIG welding on a car?

dragred 39557 19
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 2328845
    dragred
    Level 11  
    Hello everyone. I have a small question: what should I do if I want to weld something on the car, for example with a MIG welding device? I don`t know if I should disconnect the battery during welding or something. I once read something somewhere, I don`t remember where, but a guy said that he was in a car repair shop that was trying to replace mufflers, and it turned out that a hook holding the muffler had broken off, and the mechanic decided to weld it. after all this procedure, the car started going crazy, something happened to its controller (computer). What should you do to weld your car safely?
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  • #2 2328909
    Maj Marcin
    Level 15  
    Hello. You should, of course, disconnect the battery, and during welding, the ground from the welding machine should be connected as close to the welded place as possible.
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  • #3 2328923
    dragred
    Level 11  
    ok, thanks very much.
    Regards.
  • #4 2331109
    Madzia i Adam
    Level 12  
    Also remember about fuel, when I had practice in a mechanic`s workshop, after disconnecting the electrics, he lifted the car that had tilted with a full fuel tank, went into the sewer and started welding, not noticing that there was a leak. When it caught fire, we quickly managed to push the car out so that the workshop wouldn`t burn down
  • #5 2333116
    Slawek J
    Level 30  
    The best and safest way is to disconnect the battery so as not to damage anything in the car`s electronics. I don`t really believe in the protection installed on the battery.
    Regards.
  • #6 2334709
    andrzej20001
    Level 43  
    disconnect the 2 battery terminals and connect them together. Ground the welding machine as close to the welding site as possible.
  • #7 2373946
    lajkonic
    Level 16  
    Hello, the times of disconnecting the battery during welding are long gone / modern engines and their equipment have certain rules when disconnecting the battery / today there are `overvoltage` devices that are attached to the terminals... best regards Zdzislaw / of course the battery remains connected/
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  • #8 2376265
    waldekel
    Level 28  
    There is never 100% certainty when using overvoltage devices. However, the surest way is to disconnect the battery, and an even safer way is as andrzej20001 wrote
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  • #9 2377383
    Sławek62
    Level 17  
    waldekel wrote:
    There is never 100% certainty when using overvoltage devices. However, the surest way is to disconnect the battery, and an even safer way is as andrzej20001 wrote

    I support the statements of Waldek and Andrzej. I will also add that not every workshop has overvoltage devices.
  • #10 2377810
    tomekb
    Level 26  
    disconnect the battery and remove the ECU
  • #11 2378448
    kubus4995
    Level 20  
    Just disconnect the battery and the problem is solved, I know of a case where an alarm went off due to welding with the battery connected. So, general health and safety when welding + disconnecting the battery, as my colleagues have already mentioned, and as you know, electronics sometimes fail a bit and it`s better not to risk it.
  • #12 2378646
    hobbista
    Level 22  
    What about the battery when using a welding machine?

    Added after 1 [minute]:

    What about the battery when using a welding machine?
  • #13 2378725
    kubus4995
    Level 20  
    Either way, whether you weld mig or weld, it is better to disconnect the battery, it is better not to risk it. As far as I remember, there is no electric arc during welding
    only the flow of current with low V and high AMP and this is a local effect. qurde is a mechanic, not a sheet metal worker :D :D

    Added after 15 [minutes]:

    andrzej20001 wrote:
    disconnect the 2 battery terminals and connect them together. Ground the welding machine as close to the welding site as possible.

    A question for my friend andrzej20001 - what is the importance of connecting the terminals together? :?:
  • #14 2379003
    waldekel
    Level 28  
    Electronics are sensitive to high potentials (overvoltages) accompanied by an electric arc. Short-circuiting the terminals will prevent overvoltages from reaching the electronics - otherwise equalizing the potentials.
  • #15 2379139
    kubus4995
    Level 20  
    buddy waldekel, thanks for your answer. Regards. :|
  • #16 2380048
    azibik
    Level 32  
    who can logically explain how
    the advantage of installing it in your car is to get it
    voltage coming from the car body
    I`m not interested in any of the ladies
    she said
  • #17 2380144
    kubus4995
    Level 20  
    During welding, an electric and magnetic field is created, which causes interference with electronic devices, try to make a call from your cell phone while welding, standing between the power cables (I had this happen a few times while welding with an electric welder). Hence, the method is to place the mass cable as close to the welded area as possible to minimize its size. this field.
    Therefore, the greatest influence on possible damage is where we connect the mass cable. :idea:
  • #18 2380385
    Tomek665
    Level 28  
    azibik wrote:
    who can logically explain how
    the advantage of installing it in your car is to get it
    voltage coming from the car body

    And who said that this tension comes from the body?
    Strong changes in the magnetic field from the welding cables cause voltages to be induced in the car`s wiring
    Also regarding short-circuiting the terminals:
    If we don`t want to do this, we can turn on, for example, parking lights, the effect will be similar
  • #19 2383416
    waldekel
    Level 28  
    Quote:
    If we don`t want to do this, we can turn on, for example, parking lights, the effect will be similar

    In a sense, yes, but it may not be enough. Electronics are very sensitive to surges.[/quote]
  • #20 2383583
    gumiś_rzesz
    Level 25  
    Have any of you seen how nicely the 2F capacitor in the trunk of a car audio sparkles after shorting the terminals? It`s a nice sight, but quite expensive.
    I don`t recommend shorting it, just put the bulb between the terminals.
    REGARDS
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Topic summary

Before welding on a car, it is crucial to take several safety precautions to protect the vehicle's electronics and prevent potential hazards. Key steps include disconnecting the battery to avoid damage from electrical surges and connecting the ground of the welding machine as close to the welding site as possible. Some users recommend short-circuiting the battery terminals to equalize potential differences, while others suggest that modern vehicles may have overvoltage protection devices that allow the battery to remain connected. However, the consensus leans towards disconnecting the battery to ensure safety, especially considering the sensitivity of automotive electronics to induced voltages and magnetic fields generated during welding. Additionally, it is important to check for fuel leaks and ensure the area is safe from fire hazards.
Summary generated by the language model.
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