Correct metal for welding stainless?

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I'm trying to finger out which filler metal to use.I know some manifolds I'm going to be welding are 321 stainless so I'm looking at 347 stainless rods.However, will these rods also work on lower grades of stainless as well as plain steel?
Reply:The followoing has info on 321 and 347:http://www.fergusonmetals.com/347-ann-general.htmThe following has info on dissimilar metal welding, such as which filler to weld 304 to plain carbon steel, generally use 309.http://www.esabna.com/EUWeb/AWTC/Lesson5_18.htm