XJ "sheet-metal-lurgy"

Is there anything special about the XJ metal other than the "galvi" coating?Got a new gun for my Miller for .023",works pretty good but not totally happy practicing on a removed panel(22 guage).Just ordered a Lincoln Tig and need to pick up some filler rod?TIA

Miller Synchrowave 180, 1/16" Tungsten, 1/16" filler at 50 amps. Lots of time and patience... If you can get smaller filler I'd reccomend it.

Bob