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Whether its a vertical weld or laying flat on the bench, the same techniques apply, but getting comfortable can be the main thing. The ABC's of welding are ...Always Be comfortable
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.
A project that brings out topics like gas shielding and electrode extension for tig welding carbon steel
This video shows the most common welds for carbon steel.
Tips for cups, settings, and some techniques for tig welding carbon steel 11ga thick fillet welds.