I'm building a stainless exhaust system for my 69 firebird project. I got back into it after spending too much on different mufflers. The 3 chamber magnaflow muttlers are just too tight in the space.
Anyway, I wasn't pleased with the 308 stainless mig tack welds I was getting with C25mixed gas so I bought a roll of YESS brand fluxcore 308 stainless steel wire in .030.
In just one weld I got onto it pretty good, and it worked even better with a little co2 shield gas. It didn't require a polarity change either, I know normally you don't use co2 because it's adding carbon back into the puddle but in the case of the fluxcore it seems to shine like chrome.
I'll need to miter cut a joint or two and plan to tack up with the fluxcore, and then weld it out with the tig/argon and an internal argon purge where there is a butt weld. Slip over joints may not need it but it will be sealed up and purged anyway.
This might be a good solution for repair to 4-4 exhausts, the weld shines like chrome, I'm not a believer in trying to fix rusty mufflers but some guys have worked seeming miracles on them. It reminded me of moldweld 440 alloy stick rod, when the flux pops it tries to jump on your face.
