It depends on what size welds your doing mo. Welding with .025"
wire on low settings for sheet metal you will probably want to
use the #9 filter, if your pouring in .045" wire at a couple
hunderd amps you would probably need a #12 or #13. No fixed
setting it's up to you. Use the strongest you can and still be
able to clearly see the puddle.
Denny G
