Lincoln 140C Woes

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I have a new Lincoln 140C MIG (had it about a year).  I bought it for joining railing frames and pickets.  Previously I used a DC Inverter type welder for that work.  The MIG seemed easier and everything I read indicated that if you already weld, MIG is pretty easy to manage.Most of what I weld is square tubing with 1/8 inch or less wall thickness.  I’m using .025” wire and set my 80/20 gas flow gauge at about 15.  I follow the heat & feed chart settings and typically lead the puddle.  My problem is that the weld comes out nasty… bumpy and pitted with all kinds of spatter, almost as though there no shield gas.  I’ll try it for ½ an hour, get discouraged and roll the machine back in corner and feeling like I wasted a whole lot of money.Can anyone suggest a trouble shooting procedure by which I can figure out whether I’m getting sufficient shield or have the wrong settings or whatever.  I’m getting nowhere with it.Thanks.RossHarris O/A Gas, Lincoln PowerMig 140c, CE A/C 180 stickNC Whisper Deluxe Gas Forge, Centaur Coal ForgeNN Scroll Bender, Karl Hoop BenderJHM Anvil
Reply:pic will help us tell you more the chart is just a starting point you will mostlikelyneed to fine tune settinggas sounds a little low try 20cfh,-- and maybe you are moving to fast is the polarity set for Mig or FC PICS will help a lotidealarc 250/250 ac-dc tigidealarc 250/250 ac-dc tig #2 used for sticklincoln sp100hh125dual arbor grinder polisher30 yrs of hand tools52 pitch blocks 6p-26prake gauge -pitch gaugeG&D prop repair 918-207-6938Hulbert,okla 74441
Reply:Thanks prop-doctor.  I'll check the polarity and load a few pictures shortly.Harris O/A Gas, Lincoln PowerMig 140c, CE A/C 180 stickNC Whisper Deluxe Gas Forge, Centaur Coal ForgeNN Scroll Bender, Karl Hoop BenderJHM Anvil
Reply:My vote is on the polarity was wrong. Since most of these machines come with a sample roll of flux core and are set up to use it.