Switching back from GMAW to flux core.

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I have a Lincoln weld pack 100 set up for MIG.  Its fine for welding car panels and light stuff, but now I want to do something thicker than 16ga.I’m building a welding table mostly with 1/8 angle steel. I wouldn’t get full penetration with my current set up, but would it be strong enough? The rated output is 88/16/20%If not, is there much I need to do to go back to flux core?  Change the sleave for the larger wire, change the tip, reverse the polarity?There were a number of other steps to set it up for gas, its been a while since I did it, but I think its ok to leave the rest as is. Right?Thanks
Reply:It's all in the manual and on the chart inside the door to the wire compartment.But yup, change polarity, put appropriately sized drive roll and tip in place, and weld away.
Reply:Ya know, if you like to try new things, try gas shielded flux core.  It runs a lot nicer than self shielded and gets great penetration.  It might be worth a try.
Reply:Despite an under powered machine, you can still weld that 1/8" material with your welder as-is and get adequate penetration if you grind a bevel on each of the edges to be welded, gap the pieces apart a little and weld it up in multiple passes.   Put in a first pass that penetrates to the other side then brush it clean and cover it with another bead on top.  Repeat untill the weld is flush with the top surface of the material.  I would think 2 or 3 passes should do it.
Reply:Thanks, that helps.  I discovered the mulit pass process when doing some searches yesterday. Your response clarifies what I'm going to have to do. I'm looking at fillet welds on mitered corners, so after I cut the mitres I'll grind them back a little so I have a groove and do a couple of passes.