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Mig wire welds without hitting the trigger?

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  • Mig wire welds without hitting the trigger?

    Hi everyone, new to the forum, just picked up this sweet Millermatic 210 mig welder and the problem I'm having is when you touch the wire to the piece your working on the thing arcs before you hit the trigger. and its not just a short arc, the wire will try to weld. I replaced the trigger switch already and I'm not sure what else it could be. thanks for any help.

  • #2
    Mig wire welds without hitting the trigger?

    I'm not familiar enough with the 210, but on some entry level machines the wire is always hot. A friend of mine got a small wire feed welder, pretty sure it was a 115v, and it welded fine but the wire was always hot like that. I did some research and found that there are a lot of machines like that. Again, not sure if the 210 is supposed to be like that or not.

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    • #3
      I have a mm210 that I purchased new many years ago.

      Just after completing a weld, the wire is still a little "hot" for a few seconds - just enough to make a tiny spark if touched to the work, may even stick a little.

      But it is not hot all the time - if yours is, I'd take the cover off and check the contactor - it could be stuck in the closed position.
      "Beware of false knowledge; it is more dangerous than ignorance." ~George Bernard Shaw~

      Airco 300 Heliwelder
      Dialarc 250 AC/DC
      ESAB 161
      Invertec v250 and v300 Pro
      SA200
      Spectrum 700 plasma
      MM210
      Miller HF-15-1
      Dirty ugly tools - perfect

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      • #4
        Does it stay "hot" or is it just a single strike that's "hot"? Could be an open bleed down resistor. I only looked at the most recent owner's manual but it looks like resistor R1 in the diagram and possibly item 21 in figure 9-1. I'm not a welding machine tech but I would check that and the connections on the output wiring. Post your serial # and Cruizer can likely tell you where to look.---Meltedmetal
        ---Meltedmetal

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