Interesting that the "position" digit 1 is listed as being good for flat, horizontal, vertical down, and overhead. No mention of vertical up at all. And yet it's my impression that vertical up is more common than vertical down, except in pipelining.
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The key difference between 6010 and 6011 is the voltage your welder puts out,,,6011 runs at 25 volts,,,6010 runs at 26 -29 volts,,,this means that 6010 can weld at lower amps than 6011,,however 6011 is a later version of a paper cover rod and works on both Ac and DC...6011 is the better choice and is more popular than 6010,,, I started on 6010 cause that was all there was...6011 is now my rod of choice...