sheet SST & UltraCore® FC 308L?

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Any one used it on thin SST (0.020" to  0.030" thick) Yah same old story. Wannabe welder wants to sidestep  SST specialty 98/2 mix gas for MIG on SST.  The Lincoln advert says it'll run on the  75/25 Argon CO2 mix I can get 0.045 wire pretty cheap.It's that or TIG . Maybe I should TIG it?Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:My vote is tig it if you have the option to do so.
Reply:This is a fluxcore 308, yes?If so, then the fluxcore mig on SS is a good way to do it, when dealing with thin material. Sticking it and moving fast for seams is what is really needed; you are going to warp no matter what you do. Mig will often minimize this.Now, with this said; for SS that thin, I would be running .023 wire. It has been my experience with SS mig that for a given thickness of material welded, the SS filler needs a little more heat than er70 series wires. I last used 045 FC for 1/4"-3/8" steel. The 045 carries a lot of amps thru it to get a good weld. As such, the .030 sheet will likely become swiss cheese because of burn thru.It would also depend a good bit on what machine you will run. If it's a simple 100-140A 110V mig machine, the better results will certainly be with thinner wire. If the machine is more advanced and has hot start, and stitch weld/ spot weld settings, then it holds more promise because of adjustability.Tig will work fine, just use solar flux on the back of the seam for really nice results.Good luck!And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:Machine is a TA 211i  I do not believe flux core can be found smaller than 0.030" but it's hollow so it's not as much metal per inch as solid. I believe that Hobart once offered an 0.023 but no more.Solar Flux  - - check - - thanks for that.Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:Welding stainless that thin with MIG is difficult even with .023 hard wire. I can't imagine it working with .045 flux core.You can get acceptable stainless MIG welds with 75/25, but corrosion resistance will be compromised. Still may be your best bet if you don't want to spring for another bottle.Clamping tightly to a copper backing strip will reduce warping and burn-through, but don't expect it to be easy or beautiful.JohnA few weldersA lot of hammersA whole lot of C-clamps