Like gray said above, 6011 will work
And also as stated above you need to keep moisture out of your rods.
They make rod ovens to get the moisture out, I don't see why you couldn't use a regular kitchen oven on a low setting to heat them up before you use them.
Your welds, from the pics, look cold (not penetrating well).
What do you have your welder set at?
I think you need to turn it up.
Here is some info I found with a quick google search
http://www.thefabricator.com/article...-6011-and-7018
It says the 7018 is easier to run and needs to be kept moisture free.
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