Stick or flux core for butt welds on 3/16' cor-ten?
I did some recreational welding quite a few years in the past, and now a friend has asked me to do a small amount of welding for a project of theirs. They are looking to have some ~3/16th inch corten plates (weathering steel) butt welded to each other, as well as some ~1/2" thick mild steel bars lap welded to the back of the corten plates.
I'm obviously going practice a bit first to recall lost skills (and WOW am I looking forward to it!) but it's been long enough that I could use some advice on if you guys would recommend going with stick or flux core, especially for the 3/16th welds? If stick, is there a particular electrode type I should look for? (Gas setups, unfortunately, aren't practical at my home, where I'll be doing this.)
Also, anything special about corten that makes it altogether difference from mild steel welding?
Thanks a bunch!