200 amps might seem like a lot but with the large heat sink due to the size of the project, 200 amps was actually about right for a lot of it. I used the foot pedal and for some of the welds, I backed off the amps quite a lot but for a few of the welds I was welding a 3/16" (5mm) thick doubler a...
TIG welding cold rolled steel 3"x3" x1/4" using er309L and E70s-6 filler metal.
12 outside joints provides plenty of welds to experiment using different size filler metals and pulse settings too.
There is also a second video of filling in the corners using silicon bronze.
The difference between TIG brazing and TIG welding is brazing occurs above 840f but below the melting point of the base metal being joined.
Silicon bronze filler metal melts around 1800-1900f and carbon steel melts around 2800f.
Silicon bronze is a useful rod to have in your tig arsenal because i...