Tig welding penetration

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Couple of questions please.  Is there a way to focus dc tig.  What is the depth vs penetration expectation with tig( 2x electrode dia).  What does rust do that limits penetration. A 200 amp stick welder will do 5/32 rod which is a lot for 1/4 plate, yet  200 amp for tig is too little?  Is there a differance in how machine sets up tig arc vs stick. thanks Tim
Reply:This should be helpful for penetration.http://www.arc-zone.com/pdf/GrindingTungsten.pdfCampbell Hausfeld Fluxcore 80Thermal Arc 185Millermatic 250JD Squared model 32 bender
Reply:Thanks, will have to experiment with this info but everyone always seems to have a point on their tungsten. Tim
Reply:Sharpen the tungsten to a point. About 35 to 45 degrees. 200 amps is no sweat for 3/32 thoriated.Ian TannerKawasaki KX450 and many other fine tools