
Originally Posted by
Beginner
Hi all, just got a 200DX...And yes, I have the torch connected to the neg. post and is set to DC

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Welcome, Beginner! Torch connected to negative puts you a jump ahead!
In addition to the other tips posted here, you may want to run some practice beads on scrap without any filler and with as few "extras" as possible: use the torch switch and no pedal, no pulse, no filler metal, even: just get used to manipulating the weld puddle.
I have not TIG welded on zinc or cadmium plated nuts, but I'm guessing the fume hazard created by burning through the rust-proofing is still a threat: don't breathe it!
Congrats on the 200DX, it's great equipment.
DaveO
Oxweld oxy acet gear
IMIG 200
PowerTIG 210 EXT... Amazing!