In article .net,
Peter Grey wrote:

"Ernie Leimkuhler" wrote in message
...

I use my Burr King belt grinder for roughing and a 6" diamond wheel for
finishing.

And if you didn't use the diamond wheel to finish the tungstens and just
used them as they came off the belt ginder, what would the effect be?

Peter



It wouldn't matter on heavy TIG welds, but on really thin sheet metal
you need as smooth a surface as possible on the tungsten.
It makes the arc smoother and more controllable.

Same reason you want any scratch lines going inline with the tungsten.
Smoother arc.