The only trick with welding SS is if you penetrate the back side too much it produces a "sugar" and can lead to cracking. You can trap the argon with a piece of tinfoil, like a net, or back purge - or, just watch your penetration. I use .065" tubing so when I want to make a seamless joint, I have something to grind against without ending up with paper thin tube walls. You can probably use .035" if you're going to leave the joints exposed.
Just out of curiosity, ask your instructor what rod he recommends, the general answer is 308, but I've learned to like 309L a little better.
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