Fabricating an aicraft frame. Yes, one that will eventually fly my butt around. Most advice was to gas weld this, but 1) I haven't done that since 1989 and 2) I have a MIG welder, not an acetylene setup. I guess I also didn't put it down, but my wire was .025.

Hey gents, new to the forum, looks good. I have some welding experience from years ago, but I'm relatively new to MIG. Looking to use a Lincoln 140 and ER70S-6 wire with an Argon/CO2 mix to weld 4130 chrome-moly tubing. Tubes are 5/8" in diameter, walls are .035 thick. I welded with no pre or p...