If your mig welder has an inductance setting, setting it very high can help with very low wire speeds to slow things down and still maintain a smooth arc.
For 11ga steel, normally downhill would be used because uphill would tent to crown up excessively.
with a high inductance along with a very low wire speed, uphill was no problem.
19.5 volts with 190 ipm wire speed using .035" er70s6
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WELD PROCESS = GMAW, SHORT CIRCUIT MIG, GAS METAL ARC, BARE WIRE MIG
METAL TYPE = CARBON STEEL, COLD ROLLED STEEL, AISI 1010
THICKNESS = 11ga
WELD TYPE = Fillet weld
JOINT TYPE = lap joint
POSITION = 3f vertical uphill
VOLTS = 19.5 volts
WIRE SPEED = 190 IPM
WIRE SIZE = .035"
POLARITY = DCEP
GAS FLOW = 20-25 CFH C25 GAS
CTWD = 3/8”-1/2"
FILLER METAL = ER70S6
ADDITIONAL SETTINGS = inductance set to maximum
TIPS:A relatively short stickout aka contact to work distance CTWD of 3/8” to 1/2" makes a big difference.The technique shown is simple series of triangle shapes that traces the leading edge of the puddle