hi everyone new to the forums and new to tig. i have a new synchrowave 200 and i am currently attempting to fill the holes in the sheetmetal fire wall in my car. the gauges range from 18-22. i have adjusted the amps from 10 to 35, tried the pulse feature (no luck??), im using 2% tungsten size .040, 1/4"-3/8" cup, argon set at 20psig with 3 second post flow. having a lot of difficulty with burn through. just wondering where i should set the machine up for this size material. am i on the right track?? any tips for a beginner?? i have gotten a decent grip on thicker material 1/8" and thicker. thanks in advance for any advice.