Type of metal, how thick it is, what machine you have (a/c or d/c) condition of metal to be welded.
e6011 - use on ac/dc machine for general welding. Choice for dirty or oil contaminated mild steel.
e6010 - use on dc machine for general welding. Choice for drill stem or contaminated mild steel.
e7018ac- for use on ac machine, better choice for structural welds. Mild steel, must be clean.
e 7018- same as the 7018ac but for dc use.
e309L - d/c rod for welding stainless/dissimilar steels. Some "voodoo"rods that are expensive are just a version of 309L. Very strong weld, cutting torch will not cut it.
This is just a few out of hundreds.
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