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The problem with tig welding carbon steel square tubing is that is is easy to melt thru and pull oxides into the puddle. When that happens, the puddle gets weird. Pulse settings can help.
In this video, I go over mig welding settings for short circuit mig welding in horizontal and vertical uphill. Also a quick tip for vertical uphill settings. Arc shots and techniques are shown in detail.
12 inch pipe with 35 degree bevel.
Open root welded with 5/32" XX10 electrodes
fill and cap with 3/16"
Downhill root with XX10 rods are very common in the oil and gas industry.
A very valuable high paying skill is to be able to make good roots like this.
In pipeliner terms, its called "the bead"