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Thread: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

  1. #1
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    Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    Hi all;

    Just about to take up some MIG welding for the first time. Did some Oxy-Acetylene welding about 20 years on a short course and looking forward the simplicity of MIG welding. I just bought a Lincoln Electric 140 MIG-Pak welder, and (from what I've read so far) it seems it will be adequate for the work I intend to do restoring a 1970 MGB Roadster (body panel patches, frame section replacements).

    I noticed that Eastwood has a MIG "Spot Welder Kit" (http://www.eastwood.com/spot-weld-kit.html). I'm curious if this nozzle attachment would fit the Magnum 100L gun that came with my LE 140 welder? It looks like it could be a useful addition. I've attached a picture, as well as a shot of the Magnum 100L gun.

    Does anyone happen to know?

    Tim

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  2. #2
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    I forgot to mention that the ad says these heads fit "Tweco"-style guns. Being new to welding, I'm not familiar with what "Tweco"-style refers to.

    Is my Magnum 100L a "Tweco"-style gun?

    T

  3. #3
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    Tweco Makes guns for every type of MIG welder. I think now every one copy's their style of gun. I would say if that second picture is your gun then yes it is a Tweco Style gun.
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    Tim, welcome to the forum.
    Lincoln A/C 225
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    USAWELD (HTP) also have a spot weld nozzle for the Magnum 100L gun.

    http://www.usaweld.com/Lincoln-MIG-W...aded-parts.htm

    At some poilt Lincoln changed the Magnum 100 somewhat. HTP would know which nozzle fits which version.
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  6. #6
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    That 140 will do ya right but keep the welding to material 1/8" and lighter. Dont be fooled by "claims". I use my 140 every day but reach for horsepower on thicker schtuff
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  7. #7
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    Quote Originally Posted by Oldendum View Post
    USAWELD (HTP) also have a spot weld nozzle for the Magnum 100L gun.

    http://www.usaweld.com/Lincoln-MIG-W...aded-parts.htm

    At some poilt Lincoln changed the Magnum 100 somewhat. HTP would know which nozzle fits which version.

    Thanks very much, Oldendum... I didn't know of USAweld.com (I live in Canada)... lots of good stuff there, for sure.

    After reading a few other reviews of the spot weld attachment from Eastwood, I decided against it because of poor quality reports.

    Thanks to all others who replied as well.
    Tim

  8. #8
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    Re: Lincoln Electric 140 MIG-Pak - 1970 MGB Restoration

    Get some silicon bronze MIG wire .023" or .030" and 100% argon. It's actually called MIG brazing because you don't actually melt the parent metal. When you weld the metal it tends to warp the panel and it rust much faster along the weld area.

    The cars were a lot thicker metal in 1970 and the silicon bronze wire doesn't burn off the protective zinc coating. I bought some copper weld trough primer for this purpose of welding patch panels. You can use zinc primer but it's not as good and it creates toxic fumes. I repaired this heavy cast iron fireplace with .030" silicon bronze and my Hobart 135 MIG welder. Some of the bolts that hold the legs on were rusted away and you couldn't remove them. So I welded them from both sides and it seems to be working well. No cracks after 1 year and it aged in well with the existing color.

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