I have been doing a lot of practice with steel recently. Last year I did the TI course at UBI and before that some welding classes at the local tech school. I have been slowly getting a TIG set up put together. I have worked on some other projects with thicker stock before working on thinner tubing.
Steel seems to take the heat differently than TI does. I feel like it will take as much heat as you want to give it and then melt a hole before you can blink whereas while at UBI the TI seemed to be much more predictable. I have welded a practice frame that I then cut up for more practice tubing as I wasn't happy with the results (lots of holes that were filled and dimensions got funky). I feel like I have started to get a good weld sequence and getting better puddle control and am looking to improve my skills as I feel like I am hitting a bit of a plateau. In the pictures my stops are on major axis which I have gathered isn't the best for frame longevity but I have a habit of stopping just short of overlapping so I have been trying to over compensate.
What I am becoming more concerned with is the interior sides of the tubing where the welds are. I seem to be building up some material on the backsides which doesn's seem like the best for finish work or weld quality. With other steel that I have welded this doesn't happen as I have mostly worked on thicker material. At UBI we back purged everything as that is the only way you should weld TI. I ordered a dual flowmeter and other parts to set up a back purge system as I feel like a back purge system would help with this.
The tubing is all whatever True temper Henry James had on clearance a while ago. The sections that I have been welding on are in between the butts so they are pretty thin (at least for me).
My current welding settings/ setup is:
75A peak, 1.2 PPS (I have a maxstar 210 which doesn't let me set the background % etc), 1/16 ceriated tungsten, #8 nozzle with lens. Filler is .045 ER70-S2. Argon flow is ~15-18 CFH with 4s of post flowEverything has been sanded with 80 grit emery paper then 3M pads and 91% isopropyl inside and out. I have also been cleaning the filler with the 3M and Isopropyl.
Any assistance, criticism or wisdom would be greatly appreciated.
Thank you
Matt Hill
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