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Thread: 140 pro mig trouble

  1. #1
    Join Date
    Nov 2021
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    140 pro mig trouble

    I have a 140 pro Mig that is giving me trouble. I"m using 030 wire with a gas mix. Machine will turn on but when I try to weld I get no penetration and crappy response no matter the setting on panel ( seems to be worse on higher setting).
    No idea whats going on with machine, Wire feeds fine it is on it's own outlet

    Jess
    Last edited by JessC; 11-26-2021 at 06:19 PM.

  2. #2
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    Re: 140 pro mig trouble

    Verify good grounding on shiny metal.

    Verify polarity for gas (MIG) if you recently used fluxcore.
    Burt
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  3. #3
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    Nov 2021
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    Re: 140 pro mig trouble

    Metal is clean ans machine is set for non flux (never had flux core on machine)

  4. #4
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    Re: 140 pro mig trouble

    Quote Originally Posted by JessC View Post
    Metal is clean ans machine is set for non flux (never had flux core on machine)
    Is the ground (dinse) good/secure at the machine?

  5. #5
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    Re: 140 pro mig trouble

    Get a multi meter. Connect it to the polarity panel. read open circuit volts.
    Then short the miggun to the work. If it drops real low miggun is ok. But if DC volts stay near the open circuit reading. Miggun has a failing weld conductor in the miggun.
    Common problem for the magnum 100L miggun to fail open. weld conductor breaks under the rubber strain relief right where the trigger wires come out. You can pull the strain relief back and look in.
    If the voltage drops way low when output is shorted. Check the voltage tap switch.
    They can get burnt and worn out. After that you will have to check all connections in the weld circuit inside the welder. Once and a while connection to the diode assemble get burnt and loose.

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