I believe I'm late to the show but you never posted your success so perhaps you're still hunting...
The three common things for bad arc that I've found are:
1: Bad Grind
2: Bad Ground
3: Bad Gas
Specifics of the 3 Bad Things:
1: Tons of arguments here but a bad grind gives bad arc. If you have a flat spot, the arc will focus there. What seems to be the "trick" is getting a perfect grind and spiral all around. The more concentric, the better the arc. If you half ass it you will have wander. If you do a decent job on a bench grinder, you'll have a decent arc with some noticeable wander. If you become an expert (in time) on grinding, in my personal experience you will never experience arc wander. What does a perfect grind look like? I dunno but a consistent/concentric pattern all around your tip seems to be the key. Whether it be CONSISTENT straight lines, or a fancy CONSISTENT curve all around, as long as the spacing and pattern is 100% consistent all around your grind, life should usually be good.
2: Make sure you have a good flow of electrons to your piece. Basically you need to make sure things are clean, clamped tight, and you have a good gauge/quality wiring for your ground clamp. In the end the truth is electricity is resilient and will find a way if it's possible but if you have crap/paint/anything but bare metal, TIG'in will present problems.
3: If you're not getting enough gas, life will suck and you'll have the worst experience ever. How do you tell if gas is running? give a quick push to your pedal or trigger and listen. If you hear it blow air(gas) out the cup, you're good. If you don't, then maybe it's too low. Either way give a feel with another "push" and hopefully you feel something come out. If not, it's too low or clogged. Argon isn't something that "clogs" up so if this is an issue you've got a pinched line or bad regulator. If you suspect either then crank the gas up real high and give a quick hit. If you still don't feel or hear anything then you've got some issues with a regulator up to the components inside that control gas flow including leak control from those internal valves. What should you be "feeling" with the gas hitting your flesh? The lightest breeze or one of the lightest pressures your air compressor can put out is very similar. Even pursing your lips and blowing on your finger tips should be similar.
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16+ Year Security Engineer developing cool shit and stoppin hackers