Welding electrodes differ in the following properties:
Size (Diameter & Length)
Tensile strength
Core material composition
Coating material composition
Welding position
Welding rod sizes
Typical rod sizes are 5/64, 1/16, 1/8, 3/32, 5/32, 3/16, 7/32, 1/4 and 5/16 inch. The thicker the rod, the higher your amperage rating has to be. Thus, if you need to weld thin metal sheets, you should also prefer thin welding rods. The length usually ranges between 12″ and 18″.
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