Hobart Handler 140 mig, it is affordable and works great from sheet metal to 3/16 off-road bumpers. Also, have a Miller Thunderbolt when stick is preferred
option.
These work incredibly well and allow for on car work if needed.
https://www.oreillyauto.com/detail/c/titan/titan-double-flaring-tool/ttn0/51535/v/a/18957/automotive-suv-2007-toyota-fj-cruiser?q=Flare+tool&pos=0