Stick welding thin wall SQ tube

[posixPilot]

I'm not set up for TIG yet, and it was an out door project. The large fan I used to blow away the zinc fumes would have done the same to the shielding gas

Cheers
Mike

[JBnID]

If all the welding is flat, 7024 would be my pick. 1/8" @ about 120A will deposit much metal in the big gap without blowing through. I know it's counter-intuitive but it works.
A shameless plug for what I sold 25 years ago would be for Rockmount Research and Alloy's Tartan A and B. Tartan A 3/32" will run down to 20A and wont stick.