Help me get better (pics inside)

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Just started welding this semester (about 3 weeks now, twice a week) the machine I'm using is a Miller 22S connected to a inverter (I think) settings are gas on 30 (86/14 argon/Co2) wire speed on 3, volts on 19.5 and another knob on 30 I cant remember what that is right now.  Here is a butt joint, lap joint and fillet welds.The bottom one is a butt joint, I went to slow on it, the edges was 90 degrees, the shadows in the middle bead looks like holes, but those aren't holes (fillet weld) the top one is a T joint fillet weldClose up on the middle weld in the middle of the top pictureTwo lap joint fillet weldsAnd here's the tip after welding for awhile, I know it needs cleaned, but does it tell ya anything that might help me?  The stick out is a little longer than it usually is when I'm weldingAny advice/critiques would be helpful and appreciated.  BTW I'm left-handed if that makes a difference.Thank youLast edited by brow_tines; 02-18-2014 at 04:40 PM.
Reply:Can someone tell me what wagonwheeling is?
Reply:Have you noticed any difference in the way your weld puddle behaves and what your final weld bead looks when the mill scale is cleaned off as opposed to when it is not cleaned off before you start to weld?Some kind of Big Blue constant current welding machineAnother smaller yet, Blue machine (it's got wire in it)
Reply:No, they don't have us remove the milscale