http://weldmongerstore.com/
http://www.weldingtipsandtricks.com/arc-welding-6010.html
Video shows padding beads using 6010 rods. This is a fundamental exercise that most welding schools use. I think using 6010 rods for padding beads is a better choice than 6013 welding rods because 6010 is the rod used for open butt root passes and that is the skill needed to get a good paying welding job.
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