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The ABCs of welding are Always BE Comfortable. Finding a way to prop when you are welding overhead can be the main issue and makes a big difference. Sometimes you might even need to use a clamp to prop on . whatever it takes to get comfortable.
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