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We used to fill gaps using 12s with the flux knocked off and then either arc or mig them in! Worked well!

Looking at the second weld, the volts are too high. Turn them down a notch.

16s are the rods you need for thin metal and amps around 40. (12s are 2.5s 14s are 2.0 and and 16s about 1.6) if you are asked the size in mm. 12s need about 90amps so you can work your way down through the amps from there for smaller rods.

Heat the rods before use. A simple trick is heat them with a blow lamp!