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MIG welding uphill requires lower settings. A pro tip is to just use the chart or auto settings for thinner metal ( 2 thicknesses usually works well).
MIG welding thin wall square tubing in a common fixed position.
Weld sequence can help prevent distortion.
The 3G plate test is sometimes used for MIG welding certification tests.
This video will be particularly helpful for a 3G certification test with uphill and downhill root passes.