1986 Buick GX1
GX1 #001 [The One and Only]
Is the type you used stainless ? Wonder on the filler you used for the welding.
I use 308 stainless wire in my MIG, it's non-magnetic, non tarnishing and seems to work well with 409 and 304 stainless tubing.
I believe it would work just as well for TIG.