Totally off base, I have a plasma table and have cut lots of alum panels that become tanks. A buddy was putting 40ish psi to one of the air chambers and it broke right on the weld seam. Right down the middle. Same as a hydro tank I made, both with 4xxx filler when welded. With some research, I have seen where it says non shielded plasma cuts with air can oxidize the HAZ of the cut and have to be manually removed, which can go pretty far back. Another article I read said that mainly applied to 2's, 6's and 7's, and not as much of a deal on 1's, 3's and 5's. Just curious if you just clean dross to a clean edge on plasma cut alum or if you remove another 1/16 or more to get past the HAZ. I have only encountered this in the last year or so, and just said screw it and cut the last couple tanks with a saw and formed/welded from there. On other stuff not pressured, I still just cut/clean/weld.Mark was able to get sendcutsend.com to sponsor my instruction with coupons of material!
I have a lot of questions for them both.
Your remark about sendcutsend made me think about this.