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6011 is used primarily on AC welding. You would not normally use 6010 on AC as it is designed for DC. Both rods are for the smae types of work. Can be used on rusty metal, but your results will not be as good as you will get rust particles in the weld (inclusions) and they weaken the weld. Both are deep penetration rods and not suited for light metal. neither one lays down a "pretty" weld, but thta is just a characteristic. I'd say use 6011 with that Buzz Box. It's probably an AC only machine. Newer models can flip to DC. 6012 and 6013 do not penetrate as deep as the others and are recommended for sheet metal. Both lay down a nice looking weld, but aren't as deep. 7018 is a low hydrogen rod and good for high strengths on implements that need a good strong weld. It must be kept very dry. Welding shops have ovens to keep to dry. You need some skill to use this rod. Best on AC. 7014 and 7024 are "iron powder" rods. They have iron powder mixed into the flux coating and it becomes part of the weld. 7024 has more powder than 7014. They are also called "drag rods" as you can rest the end on the weld and just let it melt and flow. Makes a good looking weld. Remember, the higher the first two or three numbers, the stronger the weld material. An old metal fab and welding teacher.
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