Wire Thickness?

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Newbie.What's the deal with mig wire guage?  Is one better than the other for different projects?My little mig came with two different thicknesses, whats the rule?
Reply:From: http://www.millerwelds.com/resources...tips/MIG_tips/ Attached ImagesEsab TradeMaster TorchSmith AW1A Airline TorchLincoln AC/DC 225/125Millermatic 252 w/ Spoolmatic 15aThermal Arc 190 GTSSpeedGlas 9100v
Reply:Perfect, thanks!
Reply:Welcome to the forum brendonv!  By the way, what kind of mig you got, just curious?A few of my toys !LinuxMintManjaroMiller Roughneck 2E Lincoln WeldPak 100HTP MTS 160 Chicago Electric 80amp Inverter   Victor O/A
Reply:Small, Lincoln 140.
Reply:In that case, you'll want to favor the smaller wires.  With my Hobart 140, I use .024 and .030 with gas, and .030 flux core.  A 120v machine isn't going to have the juice for the thick wires.Jack OlsenMy garage website
Reply:I use .024" for everything on my Miller 135, up to 1/4" thick.
Reply:See the miller 135 manual, page 13 and 24.Each wire size has an optimum range of currents. Ranges will overlap, choose the best size/current range for the job.Last edited by transit; 10-30-2009 at 08:31 PM.
Reply:Originally Posted by transitSee the miller 135 manual, page 13 and 24.Each wire size has an optimum range of currents. Ranges will overlap, choose the best size/current range for the job.
Reply:welcome brendonvI use 024 in the 130 and 035 in the 200 mostly because its  convenient .FelonCaution lurker lives here" hmmm That is serious,pass the ganja and pick up a  24 of MGD"
Reply:so basically, thin wire for thin metal, and thicker wire for thicker metal?