Frank, I am just now catching up as I have been down in Iowa for TMMs show so forgive me if somebody already gave you this welding tip. I am about twenty pages behind I think. Any way when doing TIG like that a lot of time it is easier to “purge weld” it. By that I mean put a splitter on your argon line side and tape off or seal back side of weld, you can use duct tape or whatever, then put your extra argon hose thru the tape or whatever barrier you created. You do not want a lot of pressure just the bare minimum to push out the air and displace it with argon. A lot of times I will put a small hole in the duct tape and start filling with argon, it does two things. Allows you to verify your space is all argon and also acts as a pressure relief if you will. Remember just enough pressure to displace the oxygen. Obviously the smaller the area of containment the better. By doing this you successfully encapsulate the entire weld area both front and back. Anyway once you get a flow of argon out of your relief hole TIG the offending area. TIG is very finicky for cleanliness and much less forgiving than wire or stick. As you add fill rod the puddle cools and becomes taller thereby jumping on your tungsten. When you sharpen your tungsten be sure and always grind it long ways down the length of the tungsten. If you hold the tungsten 90 degrees to sanding or grinding stone the resulting grooves in the tungsten are then perpendicular to the gas flow of the argon. This creates turbulence at the puddle which does not help. Sorry this is so long winded but TIG has fed my family for years and shown me a lot of country!