I am suprised others havent jumped in here. I have welded a LOT of things over the years. And I consider myself to be a good welder. But I am by no means a professional.
And honestly, I dont think I have ever did the method I mentioned. (6011 root/7018cap). I only stated that because it seems that is what everyone says most of the time:confused2:
You can do what you want. But if you arent a newbie to welding, just do what you are most comfortable with. Because it doesnt matter what rod or method you use, a good weld trumps a poor one. So if you havent ever welded with 6011/7018, your first go at it probabally isnt going to be the best. In which case, I would say a rod you are familiar with would be stronger, or just practice with the 6011/7018 until you feel comfortable enough to tackle your project.