glad to see i'm not the only backwoods around. i found out that if i use a wire brush that has been used on carbon on duplex i'll get rust on that weld. if i use a 302 stainless brush, it's all good.
fun4now asked a good question. how do you keep a steady arc if there are ridges all down the tip?
I use only ss brushes and as far as the tungsten goes I have never had a problem. Where I worked everyone ground their tungsten the same way and I don't recall anyone complaining of tungsten sputtering or the arc wandering. I still tig in my garage today and grind my tungsten the same way. I mostly tig because wheelchairs and sparks dont seem to get along but still stick weld from time to time.