8 3/4 housing brace and perch welding choices

You can TIG weld it, but you'll need a fairly high powered TIG machine. Assuming the brace is 0.187" thick, you'll need around 175 amps to fillet weld it, or 150A if it's a corner weld. If it's only 1/8" thick, then less current will be needed. If I had to choose between stick and TIG for this, I'd use TIG if I had a big enough welder. Cleaner, and better heat control.