Click play or Download from iTunes
Today we’re TIG welding some carbon steel lap joints. Roughly .120 thick. That’s three millimeters thick. We’ll talk a little bit about filler metal size, gas lenses, and why the second side usually welds worse than the first side. Let’s get into it.
Just a few videos ago I talked to JD out back of his new location sitting on a gang box and asked him what kind of work he liked to do. You remember that? What’s your favorite kind of work?
JD: “Favorite kind of work is either big pipe or big mezzanine, just doing the bigger, heavier stuff. It just pays better too.”
This is gonna be a really quick video. I’m just trying to add to the conversation from the previous video about AC frequency.
So in the previous video, I got this piece of eight inch tubing, 070 wall, that’s not quite 2 millimeters. Put some lines on it, put it in a positioner. Propped my hand on a stand. And once I got the travel speed kind of figured out, where I keep it all the same, try to get me out of the equation, then I experimented using 50 Hz. That was this right here, how it was penetrating all the way through with no problem. And then I didn’t change anything, and increase the frequency to 250 Hz. No penetration. Got a narrower bead and a higher-pitched sound, but that’s about it.
I’m TIG welding aluminum today, and I’m comparing AC frequency. I’m gonna compare 50 hertz to 250 hertz. I’ve got some aluminum tubing, some eight-inch aluminum tubing, O-70 wall. It’s a bit less, a little bit less than two millimeters thick. I’m gonna set it up on a positioner and I’m gonna compare penetration, same amperage, 50 hertz, 250 hertz. Let’s do it.