Heavy equipment repair shop I worked at. We used a Lincoln wire feed, Lincoln 11# flux core spools. Rig was set up to run flux core or swap out for standard mig wire and gas. Mostly used flux core.
Home shop I have 2 110v flux core machines. Can also weld with my oxy-acetylene rigs (have 5) or the true old fashioned way, anvil and forge with straight borax as the welding flux. I've been hammer welding wagon wheel hoops and Damascus steel blade billets since I was 10...
With the volume of projects around my place, I tend to do cutting, lay up and tacking, and then drop the items off for final welding elsewhere. 400 pecan trees and an 1841 plantation house eat up a lot of my time. Plus the 1960 in ground swimming pool, the 1925 garage, 1925 cattle barn, the 2 acre pond to maintain, several commercial organic produce fields to manage...