You only need 100% Argon if you are MIG welding Ali which is a whole new world of ball ache. The seam won't rust if you use Co2/Argon mix on stainless but you will get spatter which will make a mess of the surrounding material the same as welding mild. The reason TIG is prefered over MIG on stainless is it pre-heats as you go as material like 316 is hard stuff. Tig is used in production welding of stainless as there's no need to clean the weld up after it's been done, with most of it being on show in things like kitchens and bits of boat which saves time and money.
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