Does anyone have any ideas on tig welding brass. I've tried it ,but I was going to get some input before i went any further. Such as,

  1. pulse or not
  2. filler material
  3. ac or dc and polarity
  4. pre heat / post heat

I just have some questions for someone that may know. I have some parts to build up and it's going to be like building up a knife edge. It's not going to take much build up. I done a sample for the customer and built up the whole edge and it was to much build up. The guy who use to do it would lay a small bead on the knife edge and the customer would simpily file it back off. The guy is not around any more so they want me to fix the parts and i've never welded brass. Thank in advance.