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Thread: Repairing a MIG Welder?

  1. #1
    Web Wheeler
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    Repairing a MIG Welder?

    I have a Blue Point MB135 MIG welder that has worked great for a long time with minimum maintenance. I hadn't used it in about 4 years until today. I started welding on some scrap to get it dialed in and practice a bit before fixing a spring mount on the FJ. After about 3-4 minutes of very short welds the Duty Cycle light came on. I don't remember it ever coming on before after lots of long stretches of welding. It's been over half an hour and it still comes on as soon as I turn on the welder. I'm pretty good with electronics and can solder in new components, but I don't have very good equipment at home to troubleshoot with. Does anyone here know anything about MIG welders and how to fix them? It's dark out now, so I'll probably take a look at it tomorrow, but if anyone knows where a good place to start is, I'm all ears.
    Brizz

    Be careful infringing on peoples 2nd amendment rights with your 1st amendment rights, because you probably wouldn't like it the other way around.

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  2. #2
    I support Reno4x4!
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    Dennis
    I haven't worked on a MIG welder but most welders have a thermal cut-out that disables the unit when it gets too hot. I'd disconnect the power, open it up and look for a thermal cut-out switch. If you see a heat sink then the switch will be attached to the heat sink to detect over-temperature. If the unit has a fan then check that the fan is working. If the fan or it's control circuit fail then you would get the symptom you're describing. It may be as simple as replacing a thermal switch.

  3. #3
    Web Wheeler
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    There are no active components on the heat sinks. There is a relay on the board that when I tapped on it with the butt of a screwdriver, the duty cycle light went out. Unfortunately, the welder only worked for about 1 inch of welding before it stopped again. Rapping on the relay didn't work this time. I'll see if it works tomorrow after it cools down, but something is wrong with it. It never overheated before this.
    Brizz

    Be careful infringing on peoples 2nd amendment rights with your 1st amendment rights, because you probably wouldn't like it the other way around.

    FJ-40 on 37's, locked/posi. Stock Grand Cherokee.

    Looking for 68-74 FJ-40 doors.

  4. #4
    Web Wheeler
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    OK, I think I got it. The thermal switch is on the coil and was very dusty. I don't know how I missed it before. I rapped on it and blew the dust off several times to clean it off. I was able to complete the welding on the spring mount and welded about 4 more inches on scrap with no issues. I think that was it.

    Thanks Slo-motion for your help.
    Brizz

    Be careful infringing on peoples 2nd amendment rights with your 1st amendment rights, because you probably wouldn't like it the other way around.

    FJ-40 on 37's, locked/posi. Stock Grand Cherokee.

    Looking for 68-74 FJ-40 doors.

  5. #5
    I piss excellence.
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    If it gives you trouble again maybe contact Werty, he's fixing welders for a living now.
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  6. #6
    Web Wheeler
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    Quote Originally Posted by CashMoney View Post
    If it gives you trouble again maybe contact Werty, he's fixing welders for a living now.
    Thanks. I thought I'd read on here that someone was, but I couldn't find where I'd read it and couldn't remember who.
    Brizz

    Be careful infringing on peoples 2nd amendment rights with your 1st amendment rights, because you probably wouldn't like it the other way around.

    FJ-40 on 37's, locked/posi. Stock Grand Cherokee.

    Looking for 68-74 FJ-40 doors.

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