AND, if the welder doesn't make enough heat to weld the material you are trying to weld, you can preheat the metal with a propane torch or, I use a weed burner... makes welding easier and you get better penetration...
Like chopsaw noted, the wire feed drive wheel has serrated groves designed to push different diameters of wire... the drive wheel and wire tension is important... Pull the trigger with the wire against a 2x4 or something... the wire should not slip.. it should keep pushing and bend where it comes out of the gun tip... ALSO, wire speed makes a big deal... When all is adjusted properly, the wire melting should sound like a BUZZ..... smooth Buzz... no popping ...
Don't worry about the weld... the meat and smoke can't tell the difference....
Very nice build again....
Dave