tig welding a rim

[everlastsupport]

at the end of your weld and add a little more filler to avoid a crater crack.

And make sure you have post from running and hold it over the end of the weld until it stops to help shield and avoid a crater.

JakeRu has many good threads here, you might want to look at others of his threads as well.

[piopio]

depending on amps and ac balance,a 1/8 tungsten might sort the eroding.
also keep the end of filler rod in the argon shielding,should help avoid issues with it not reaching the pool