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Thread: I Must Have Got Behind In MIG Welding Technology

  1. #1
    Join Date
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    Default I Must Have Got Behind In MIG Welding Technology

    I had to do a few small welding projects the last couple weeks. Rather than TIG them I thought I would MIG since I haven't done that in quite a while.
    I ran some practice passes on scrap piece. I wasn't real pleased with the looks of it. I've done much better in the years past. So I started to do some research on the newer MIG machines. I also noticed that my gas mix isn't the usual 75 25% like I always had used in the past. The last bottle I got was 88% argon 9% C02 and 3% 02.
    I never really heard of that tri mix, it's not for SS.
    I remember questioning the guy about that mix when I got the bottle. Can't remember what he told me, maybe that was all they had, or that's what everybody uses now, can't remember. Anyway..... never gave it much of a thought. That was back in 2006 when I got that bottle. So now I'm looking at my welds and comparing them to some stuff I did years ago and it doesn't look quite as nice and clean.
    I also got d reading about the new multi mode welder that do spray weld, that really flows out nice. Watch the video https://www.youtube.com/watch?v=vtv9PYV3q-s
    I don't know where all the smoke comes from when he's spray welding.

    Anyway...... here are some of my pics.




    Just not crazy about the way these welds look.



    I ran some tests after I switched back to a bottle of 75 25% They look a little cleaner, I got less spatter and the flow out looks a little better.
    I think the newer machines have better electrical refinements and put down smoother beads.



    My welders a late 80's early 90's vintage. A lot has changed since then.



    JL...................
    Last edited by JoeLee; 05-11-2019 at 09:56 PM.

  2. #2
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    Here are the test samples I ran after switching back to 75 25%.




    JL.................

  3. #3
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    I don't know about that tri-mix for steel. I used to pay for 25/75 but my buddy who runs an ornamental iron shop uses straight CO2. I switched to that about 15yrs ago for cost and I like it. The welds look great. Yes, there is a bit more spatter but I get some of that with the mix too.

    You're right about technology. There are pulsed MIG units out too. I don't think you need anything special for spray-transfer, mainly just the amp capacity and a good electrically stable arc. I might be wrong about that though.
    Last edited by chipmaker4130; 05-11-2019 at 10:17 PM.

  4. #4
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    Gas formula does make a big difference but it dosen't mean the weld is inferior. Mostly it is a cost thing. MBA's don't care about splatter.
    The shortest distance between two points is a circle of infinite diameter.

    Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

  5. #5
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    Good read on MIG technology and gases: https://m.lincolnelectric.com/assets...A-90/c4200.pdf

    TL-DR 75ar/25co2 mix works only for low current short-circuit mode, spray transfer needs less than 18% CO2

    88% argon 9% C02 3% 02 works somewhat ok for both short-circuit mode and spray transfer mode so its more versatile but slightly more expensive mix due to more argon content.

    Spray transfer mode is the cleanest way for MIG welding but only suitable for something like over 1/4" thickness and above 150...200A current so use is limited in a home shop.

  6. #6
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    I'm still trying to find out what the 88% argon 9% Co2 & 3% O2 mix was for. I called a couple welding supply stores and they never heard of that concoction.

    MattiJ..... can't open the PDF you posted.

    JL................

  7. #7
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    I have only used 72/25 mix when using a mig, and straight argon for tig. There are some amazing advances in mig technology, I would love to try something like a miller Continuum. That being said I use an old 300 amp airco mig machine from the 80's that is in great shape and seems to have a great arc, and melts metal together. I've never tried spray transfer

  8. #8
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    Quote Originally Posted by JoeLee View Post
    I'm still trying to find out what the 88% argon 9% Co2 & 3% O2 mix was for. I called a couple welding supply stores and they never heard of that concoction.

    MattiJ..... can't open the PDF you posted.

    JL................

    Maybe this way:
    https://lincolnelectric.com/assets/g...A-90/c4200.pdf

    88% argon 9% Co2 & 3% O2 =mainly for spray transfer high current welds of low carbon low alloy steels.
    https://weldreality.com/MIG_welding_gases.htm claims that the additional 3% oxygen is not not much any good, more of marketing ploy.

  9. #9
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    Well, now that I have a gas diffuser with holes in it C25 seems to work amazingly for me. I've got 3 local gas vendors, and the one that seems to have the best prices and appreciates their customers has never tried to sell me something other than what I asked for. If I asked for advice I got advice. Not always to buy whatever they were selling either. I have shopped in all three local gas vendor's stores. Obviously I shop in the one that seems straight up with me. It doesn't hurt they are also the closest to my shop. The other two are on a main highway in/out of town. The one I shop in is located in an industrial/commercial are off the main road. In fact three or our of my favorite vendors locally are located in that area. Seems the ones located on main roads or highways need to be located in a highly visible location to keep the doors open. I wonder if that is true everywhere.
    *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

  10. #10
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    Quote Originally Posted by JoeLee View Post
    I'm still trying to find out what the 88% argon 9% Co2 & 3% O2 mix was for. I called a couple welding supply stores and they never heard of that concoction.

    MattiJ..... can't open the PDF you posted.

    JL................
    Air products coogar shielding gas over here, BOC argosheild light I think, common stuff apparently,
    Mark

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