It might be an area thing about flux core? I worked in San Francisco a bunch on large projects including hospitals. Flux core is just about all they use for structural welding with I think a .070 wire. Suitcase welders Lincoln makes them.
I know they did use flux, I thought they got away from that??? Maybe it was just for blind corners or something? I know they had alot of issues where couldn't get the gun close enough for penetrating. So back to stick... This around '95--'98... Haven't heard anything new to say otherwise. Not only stick on pipe lines, but only certain welders.
