I get lots of free granite pieces. I want to make a "water feature" where I am going to put flat slabs about a foot apart, and on the horizontal. Each will be supported by rebar on end. I'll probably have to weld it all together, starting with some hefty stuff for the main supports like one inch. What would be your preferred rod? 6010 or 7018 comes to my mind. About half of the welding will be done in the vertical position.