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Hi Scott, 7018 is one of the most versitile welding rods there is. I can't think of too many weldments that can't be welded with 7018. Vertical up, pipe 5G and 6G( pipe on 45* with a restricktor ring 1" away from center weld) is easy to weld with 7018. 7018 Chemtron can certifiy with open root although not the best rod for such. The open root is made with Lincoln 6010(5P) then the cover pass with 7018. Once you get good with 7018 then the slag will peal off by it's self so you don't need to chip the weld or very little chipping between passes.
Even on large commerical projects I awlays used 7018 and 6010 for field work. I didn't need any other type of rod to carry around for 99% of my welding. After you run a few miles of 7018 you don't need to adjust your heat setting as you learn to manipulate the heat required with arc length and travel speed.
Now in a shop enviroment then it pays to have lots of choices as time can be saved with the correct welding procedure, electrode type, joint design. 7024 is considered a jet rod as it welds very fast and smooth but two position limited and lighter penetration than 7018. So it makes a great shop rod as you can rotate the weldments and in the field you can't do this as most welds are "in" position welds. I welded wear bars on a D8 tracks one time and used 7024 as I could rotate the weld joints to a good position each time. T_Bone
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