Positive electrode and negative tungsten

[Jitter]

Im a Little confused as to Positive tungsten and negative tungsten. Im using a Dyn 200. Is there a time where you would want the tungsten neg or pos?? And how do you do it. thanks.

[jeffscarstrucks]

Hi, I too have a 200. I can't think of a time that you would want to have the tungsten as a positive (DCEP). On an older transformer machine you would use this configuration to ball the tungsten for aluminum work but that is old school for your set-up. I might be missing a special application but for the most part a sharpened tungsten of the right diameter on electrode negative will keep you happy. Good Luck, JEFF

[paulrbrown]

Jitter, possibly on very dirty aluminum or magnesium which is very thin, remember that EP handles 1/10 the amperage as EN. so you need a pretty big electrode to use EP and it makes it harder to start with that big boy. Paul

[fun4now]

download TIG handbook

you might want to download the TIG handbook at the Miller site it covers the reason's for doing the DCEP as well as lots of other great info.


also the TIG handbook is included in the student package for $25.00 including shipping. (i got the student pack )

IMO it is well werth the $25.00 even if just used as a referance