Originally Posted by Clayten (Post 2121656)

I use 3/32 wire and tungsten all the time. I generally weld pressure pipe. I run as low as 70 amps.
To walk the cup you use either your wrist or elbow or both. The principle is like trying to move a large barrel forward by rocking it from side to side. Try it with the machine off a couple of times and then try it in a real weld.

Originally Posted by Danoz99CTD (Post 2122359)

Try both, it just takes a little practice. 3/32" tungsten is the best all around size for most of what you would weld. I'm guessing you are using something along the lines of a wp-17 or wp-24 torch, which is a large and heavy torch, especially if watercooled. Try a smaller torch. They are easier to control and manipulate. All that depends on if you want to spend some money. This kinda stuff isn't cheap nowadays. I have always worked for the government and we cannot do any of that walking the cup stuff, so I can't help you there.

Originally Posted by BigDiesel396 (Post 2122956)

I recommend 3/32 tung. and 1/16 filler. Unless we have a big gap or are running over 130 amps that is all we use. Material thickness ranging from 16ga. SS plate to 2x3x3/16 rect tube...We do a lot of TIG stainless at work for a french fry plant here and that is all we really use. Our sister company does pipe work, including pressure pipe and the only difference is they sometimes use 3/32 filler and thats only on the big stuff. I find it much easier to lay a nice bead with smaller filler wire and good tight joint...Just my .02.

Also we always use a #6 cup, we have a box of #8 cups in the parts room that have never been opened in 4 years..Every once in awhile we need to grab a #4 though to get in some tighter spaces.

Also, we have many lincoln invertec V275's that we put a TIG torch on and yes the knob on the torch is only a gas knob, we must run a seperate line to the regulator seeing as how it is technically not a "TIG" machine (although the switches to set it are on the front of the machine) it does not control gas flow through the machine, say like on a Syncrowave. The only TIG torch we have for the whole shop that has a rheostat on the torch is on a Syncrowave sitting in the shop.