The majority of the stuff that I weld for the ranch (gates, hinges, etc) I weld with 6011. I use a lot of used oil field pipe that is pretty yucky and I get better penetration thru the rust with the 6011. As SKUNKRIV said, if I want a prettier weld, I'll use 6013. I occaisionally use 7018 if I am welding up tooling for the shop. I am not an authority, of course, but these rods work for me. Occaisionally, a weld breaks, but hey, I have a couple of welders on the place, so I just re-weld it :)