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do i need to pull my alt before welding?

Discussion in 'The Garage' started by rwright07, Apr 29, 2007.

  1. rwright07

    rwright07 1/2 ton status

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    im about to weld on some clevices and have heard both ways...
    must i remove my alternator? or just disconnect everything from batteries, etc?
     
  2. burban89

    burban89 1/2 ton status

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    I just disconnect the battery.
     
  3. Xtremegmc80

    Xtremegmc80 1/2 ton status Premium Member

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    disconnect the battery thats what i did.
     
  4. JEBSR

    JEBSR 1/2 ton status

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    Never did anything other than disconnecting the batteries. Never had a problem.
     
  5. AZ79K5Project

    AZ79K5Project 1/2 ton status

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    I have read that the battery needs to be disconneced. A lot of people don't. I have never seen a muffler shop disconnect the battery when they are welding in a new exhaust system.

    What's the hazard or issue?
     
  6. buffblazer

    buffblazer 1/2 ton status

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    the hazard is when welding with the battery hooked up, the amps from the welder can travel and run thru your electronic devices and then out the battery to complete the circuit. the problem is when the amps travels thru it can make a power surge and damage your electronics
     
  7. walla2k5

    walla2k5 1/2 ton status

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    Better safe, than replace.
     
  8. buffblazer

    buffblazer 1/2 ton status

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    exactly, better to take the 2 mins to pull the neg cable than to buy all new electronics.
     
  9. RockinChevy

    RockinChevy 1/2 ton status GMOTM Winner

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    I guess that explains why my voltmeter guage went dead when I had my new exhaust welded in at a shop last year :doah:
     
  10. JEBSR

    JEBSR 1/2 ton status

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    Especially bad with a fuel injected vehicle.
     
  11. RockinChevy

    RockinChevy 1/2 ton status GMOTM Winner

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    Here's another thing.... for those running on-board Power welders, you have to run the engine to get the rpm's up to weld, right? Well, in this case, we don't disconnect the batteries or the alternator.... is it still safe to weld?
     
  12. sandawgk5

    sandawgk5 3/4 ton status

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    I guess I got lucky cause I welded a new front bumper together on the truck and my exhaust and never disconnected anything. No problems at all with electronics or anything.

    It is injected also.

    Ira
     
  13. BlazerBud

    BlazerBud 1/2 ton status

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    It's a good idea to also place the ground clamp near the electrode. You want the welding current going in as straight a line as possible, for instance, it would be stupid to have the ground clamp on one end of the vehicle and be welding on the other side, then you would have welding current traveling through all sorts of stuff before it reaches the work zone.

    I've welded several fuel injected and computerized vehicles with out a problem and I've never unhooked or damaged anything. You have to be careful if you are going to mig or ac stick weld. I only do DC on vehicles.
     
  14. rwright07

    rwright07 1/2 ton status

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    well i welded on my new shackles... they were my first steel machined pieces and my first blazer welding project... worked out well and looks good
     
  15. JEBSR

    JEBSR 1/2 ton status

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    Keep in mind this is a possibility, not the rule. You could weld on the vehicle 100 times and not have a problem, but if you burn the ECM or anything else expensive on the 101st time, was it worth it? I just disconnect just in case. It's not worth taking the chance to me.
     

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