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  1. #1
    Join Date
    Jan 2008

    Default Help with welding wire size

    I have a Millermatic 172, running Argon/co2 mix (75/25 I believe). I will be welding all 3/16 material on my next project (utility trailer). I currently have (.30) wire in the welder. For this project would I be better served to use (.35) wire. I have seen some charts and they seem to recommend this size wire for this thickness steel. Looking at the chart on the inside of the welder, it indicates that I drop to a 3 for voltage and 55 for wire speed (4/70) if I were to use the (.30) wire). Why the significant drop in voltage and would I be assured of better penetration if I increased it to 4? As an amateur, I am nervous about the strength of the welds. The steel I will be using is new with mill scale on it, which I will grind off.

    Any suggestions would be greatly appreciated.

  2. #2
    Join Date
    Sep 2005
    Salem ,Ohio


    I would stick with the .030. thats my everything size wire in my MM185...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.

  3. #3
    Join Date
    Jan 2008


    Too many variables to be welding right out of the book. Travel speed, the deposition needed and the penetration for strength can not be right from the book. Best bet is to test with a small piece and then test the weld strength on your own. I would guess .030 for this light metal.

  4. #4
    Join Date
    Feb 2008
    Rochester, New York

    Default Harley 55

    JC..........Don't be nervous as Ho in Church ?............... The gas mix is fine ........ actually I prefer 88 %- 12 % when I do short -arc ( little splatter and better sheilding ans peneration ) .............. a little weld does a long ways ............ notice I said a liitle weld goes a long ways............ short -arc produces a hard brittle weld but for anything under 1/4' ,,,,,,NP.........don't worry about the strengh........You Ok.........more then OK........... Kid Knows

  5. #5
    Join Date
    Oct 2007


    I would practice on steel first. When you weld enough steel then You will feel confident enough to answer your questions. Soon enough you will not even use the door charts. I think 0.30 is an all around good size wire for your machine.

    Just my thoughts, don't seem to be worth much these days.
    Tim Beeker,
    T-N-J Industries
    (my side bussiness)

    Miller Synchrowave 350LX with tigrunner
    Esab 450i with wire feeder
    HH135 mig
    Thermal Dynamics cutmaster 51 plasma cutter
    Miller aircrafter 330 - sold
    Marathon 315mm coldsaw
    vertical and horizontal band saws
    table saw
    Dewalt cut off saw
    Sand blast cabinet
    lots of hand grinders
    Harris torch
    beer fridge

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